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What’s happening in Israel and Gaza? What is Hamas? A really simple guide What is Hamas, and what’s happening in Israel and Gaza? A really simple guide
(2 days later)
Watch: A day of violence and fearWatch: A day of violence and fear
Watch: A day of violence and fearWatch: A day of violence and fear
The Palestinian militant group Hamas launched an unprecedented attack on Israel on 7 October, with its fighters entering communities near the Gaza Strip, killing hundreds of people, and taking dozens of hostages. The Palestinian militant group Hamas launched an unprecedented attack on Israel on 7 October, with its fighters entering communities near the Gaza Strip, killing at least 1,300 people, and taking scores of hostages.
What is the background to the group and its latest attack? More than 1,400 people have been killed in Gaza since Israel launched retaliatory air strikes and a ground offensive is also expected.
Follow LIVE: Latest updatesFollow LIVE: Latest updates
What is Hamas? What is happening in the Gaza Strip?
Hamas is a Palestinian militant group which rules the Gaza Strip. Its name is an acronym for Harakat al-Muqawama al-Islamiya, or "Islamic Resistance Movement", and means "zeal" in Arabic. Israel has told everyone in the north of the Gaza Strip - about 1.1 million people - to relocate to the south of the territory within 24 hours. It wants them to be south of a watercourse known as Wadi Gaza.
The UN said this is not possible and asked Israel to withdraw the order, warning of "devastating humanitarian consequences".
The World Health Organization said Gaza's health authorities had told it that it would be impossible to evacuate vulnerable hospital patients.
Hamas, which controls the Gaza Strip, told civilians to ignore the evacuation order, describing it as "fake propaganda". However, many people have been leaving.
Northern Gaza - containing Gaza City and two refugee camps - is one of the most densely populated parts of the territory.
There is only one main road going south, and fuel for vehicles is running out.
Hamas's military wing, the al-Qassam Brigades, is continuing to fire rockets into Israel, claiming to have targeted Ashkelon, in the south of country, with 150 of them.
How could Israel carry out a ground offensive?
Israel's stated goal is to destroy Hamas.
It has massed tens of thousands of soldiers on its borders with Gaza, along with tanks and artillery.
It has activated some 300,000 reservists alongside its standing force of 160,000.
The Israeli military has prepared for an offensive by dropping 6,000 bombs on Gaza, targeting Hamas commanders and their control centres.
One of its main targets is Hamas's vast labyrinth of underground tunnels, which link together its underground command posts.
"Think of the Gaza Strip as one layer for civilians and then another layer for Hamas. We are trying to get to that second layer that Hamas has built," an Israel Defense Forces (IDF) spokesperson said on Thursday.
Hamas has previously claimed the tunnels stretch for 500km (310 miles). Many have entrances hidden within houses, mosques, schools and other public buildings.
Israel's military is likely to avoid going into tunnels unless it has to, instead using explosives to destroy them.
It believes Hamas has laid booby traps and Improvised Explosive Devices at entry points and along narrow streets.
A major challenge for Israel will be close-quarters fighting in densely populated urban areas.
Israel believes Hamas has about 30,000 troops, with weapons including automatic rifles, rocket propelled grenades and anti-tank missiles.
Israel targets Hamas’s labyrinth of tunnels under Gaza
How would an Israeli ground assault on Gaza unfold?
What is Hamas and what does it want?
Hamas is a Palestinian militant group which has ruled the Gaza Strip since 2007.
The group is sworn to Israel's destruction and wants to replace it with an Islamic state.The group is sworn to Israel's destruction and wants to replace it with an Islamic state.
Hamas has fought several wars with Israel since it took power in Gaza in 2007. Hamas has fought several wars with Israel since it took power.
It has fired - or allowed other militant groups to fire - thousands of rockets at Israel, and carried out other deadly attacks.It has fired - or allowed other militant groups to fire - thousands of rockets at Israel, and carried out other deadly attacks.
Israel has repeatedly attacked Hamas with air strikes in response, and sent troops into Gaza during two of the wars. Together with Egypt, it has blockaded the Gaza Strip since 2007 for what it describes as security reasons. In response, Israel has repeatedly attacked Hamas with air strikes, and sent troops into Gaza during two of the wars. Together with Egypt, it has blockaded the Gaza Strip since 2007 for what it describes as security reasons.
Hamas - or in some cases its military wing, the Izzedine al-Qassam Brigades - has been designated a terrorist group by Israel, the United States, the European Union and the UK, as well as other powers.Hamas - or in some cases its military wing, the Izzedine al-Qassam Brigades - has been designated a terrorist group by Israel, the United States, the European Union and the UK, as well as other powers.
Iran backs the group, providing it with funding, weapons and training.Iran backs the group, providing it with funding, weapons and training.
Hamas explained John Simpson: Why BBC doesn't say Hamas militants are 'terrorists'
What is the Gaza Strip and why is it important?What is the Gaza Strip and why is it important?
The Gaza Strip is a 41km (25-mile) long and 10km-wide territory located between Israel, Egypt and the Mediterranean Sea.The Gaza Strip is a 41km (25-mile) long and 10km-wide territory located between Israel, Egypt and the Mediterranean Sea.
Originally occupied by Egypt, Gaza was captured by Israel during the 1967 Middle East war along with the West Bank and East Jerusalem. Israel withdrew its troops and around 7,000 settlers from the area in 2005.Originally occupied by Egypt, Gaza was captured by Israel during the 1967 Middle East war along with the West Bank and East Jerusalem. Israel withdrew its troops and around 7,000 settlers from the area in 2005.
It is currently home to about 2.3 million people, and has one of the densest populations in the world. It is home to about 2.2 million people and has one of the highest population densities in the world.
Just over 75% of Gaza's population - some 1.7 million people - are registered refugees, according to the UN. More than 500,000 of them live in eight crowded camps located across the Strip.
Israel controls the air space over Gaza and its shoreline, and strictly controls the movement of people and goods through its border crossings.Israel controls the air space over Gaza and its shoreline, and strictly controls the movement of people and goods through its border crossings.
Similarly, Egypt controls who passes in and out through its border with Gaza.Similarly, Egypt controls who passes in and out through its border with Gaza.
About 80% of the population of Gaza depends on international aid, according to the UN, and about one million people rely on daily food aid. What life is like in the Gaza Strip
After Hamas's unprecedented attack, Israel announced a "siege" of Gaza - cutting its supplies of electricity, fuel, food, goods and water. What is the 'siege' of Gaza?
Mains electricity has gone out in Gaza, after its one power station ran out of fuel. Without electricity, Gaza's water and sewage systems are also expected to shut down. After Hamas's attack, Israel announced a "siege" of Gaza - cutting its supplies of electricity, fuel, food, goods and water.
People in Gaza will have to rely on generators for electricity - if they have the fuel to run them. It says the siege will not end until Israeli hostages are released.
Mains electricity has gone out, after Gaza's single power station ran out of fuel. Without electricity, Gaza's water and sewage systems are expected to shut down.
Households, hospitals and businesses in Gaza are relying on generators - if they have the fuel to run them.
The border between Israel and Gaza remains closed. The Rafah crossing, which is controlled by Egypt, has been targeted by Israeli air strikes and has been largely closed or very heavily restricted.
Nowhere safe in Gaza as Israeli strikes intensifyNowhere safe in Gaza as Israeli strikes intensify
Gaza hospitals risk turning into morgues - Red Cross
Watch: Hiding at home, blinded and choked by dust - a video diary from GazaWatch: Hiding at home, blinded and choked by dust - a video diary from Gaza
Watch: Hiding at home, blinded and choked by dust - a video diary from GazaWatch: Hiding at home, blinded and choked by dust - a video diary from Gaza
What is Palestine?What is Palestine?
The West Bank and Gaza, which are known as the Palestinian territories, as well as East Jerusalem and Israel all formed part of a land known as Palestine from Roman times until the mid-20th Century.The West Bank and Gaza, which are known as the Palestinian territories, as well as East Jerusalem and Israel all formed part of a land known as Palestine from Roman times until the mid-20th Century.
These were also the lands of Jewish kingdoms in the Bible, and are seen by many Jews as their ancient homeland.These were also the lands of Jewish kingdoms in the Bible, and are seen by many Jews as their ancient homeland.
Israel was declared a state in 1948, though the land is still referred to as Palestine by those who do not recognise Israel's right to exist.Israel was declared a state in 1948, though the land is still referred to as Palestine by those who do not recognise Israel's right to exist.
Palestinians also use the name Palestine as an umbrella term for the West Bank, Gaza and East Jerusalem.Palestinians also use the name Palestine as an umbrella term for the West Bank, Gaza and East Jerusalem.
Israel's borders explained in mapsIsrael's borders explained in maps
Palestinian territories profile
The Israel-Palestinian conflict explainedThe Israel-Palestinian conflict explained
The Palestinian president is Mahmoud Abbas, also known as Abu Mazen. He is based in the Israeli-occupied West Bank.
He has been the leader of the Palestinian Authority (PA) since 2005, and represents the Fatah political party, which has a bitter rivalry with Hamas.
Why did Hamas launch its latest attack?Why did Hamas launch its latest attack?
Although the attack by the militants on 7 October was unexpected, it came at a time of soaring Israeli-Palestinian tensions.Although the attack by the militants on 7 October was unexpected, it came at a time of soaring Israeli-Palestinian tensions.
This year has been the deadliest on record for Palestinians who live in the Israeli-occupied West Bank, which could have motivated Hamas to strike Israel with a spectacular attack.This year has been the deadliest on record for Palestinians who live in the Israeli-occupied West Bank, which could have motivated Hamas to strike Israel with a spectacular attack.
Hamas might also have been seeking to score a significant propaganda victory against Israel to boost its popularity among ordinary Palestinians. Hamas might also have been seeking to score a significant propaganda victory to boost its popularity among ordinary Palestinians.
The fact that it has taken so many Israeli hostages captive is thought to be designed to pressure Israel to free some of the estimated 4,500 Palestinians held in Israeli prisons - a highly emotive issue for all Palestinians. The capture of Israeli hostages is thought to be designed to pressure Israel to free some of the estimated 4,500 Palestinians held in Israeli prisons - a highly emotive issue for all Palestinians.
There is also speculation that the attack was orchestrated by Iran - Israel's arch-foe - though Iran's Supreme Leader has denied his country's involvement.There is also speculation that the attack was orchestrated by Iran - Israel's arch-foe - though Iran's Supreme Leader has denied his country's involvement.
Iran and Hamas also staunchly oppose the growing prospect of an historic peace deal between Israel and Saudi Arabia.Iran and Hamas also staunchly oppose the growing prospect of an historic peace deal between Israel and Saudi Arabia.
This might be thwarted if Israel's military response to the Hamas attacks provokes widespread anger in the Arab world.This might be thwarted if Israel's military response to the Hamas attacks provokes widespread anger in the Arab world.
How Hamas' shock attack unfoldedHow Hamas' shock attack unfolded
Who are the hostages taken by Hamas from Israel?
How does this compare to previous Hamas attacks?How does this compare to previous Hamas attacks?
The BBC's international editor Jeremy Bowen says this is the most ambitious operation Hamas has ever launched from Gaza, and the most serious cross-border attack Israel has faced in more than a generation.The BBC's international editor Jeremy Bowen says this is the most ambitious operation Hamas has ever launched from Gaza, and the most serious cross-border attack Israel has faced in more than a generation.
Militants breached the wire that separates Gaza from Israel in multiple places.Militants breached the wire that separates Gaza from Israel in multiple places.
Details of a massacre in one Israeli community, Kibbutz Kfar Aza, have emerged - with an Israeli general speaking of babies killed. Israeli soldiers told Jeremy Bowen that some of the dead had been beheaded.Details of a massacre in one Israeli community, Kibbutz Kfar Aza, have emerged - with an Israeli general speaking of babies killed. Israeli soldiers told Jeremy Bowen that some of the dead had been beheaded.
Homes in the kibbutz have been completely destroyedHomes in the kibbutz have been completely destroyed
Since the latest attack began, the death toll in Israel has reached 1,200 - while more than 1,000 people have been killed by Israeli air strikes on Gaza.
Why wasn't the attack foreseen by Israeli intelligence?Why wasn't the attack foreseen by Israeli intelligence?
Given the combined resources of the Shin Bet, Israeli domestic security services, its external spy agency Mossad, and all the assets of the Israel Defense Forces, the BBC's security correspondent Frank Gardner says it is astounding that nobody saw this coming or failed to act on it if they did have a warning.Given the combined resources of the Shin Bet, Israeli domestic security services, its external spy agency Mossad, and all the assets of the Israel Defense Forces, the BBC's security correspondent Frank Gardner says it is astounding that nobody saw this coming or failed to act on it if they did have a warning.
Israel has arguably the most extensive and well-funded intelligence services in the Middle East, with informants and agents inside Palestinian militant groups, as well as in Lebanon, Syria and elsewhere.Israel has arguably the most extensive and well-funded intelligence services in the Middle East, with informants and agents inside Palestinian militant groups, as well as in Lebanon, Syria and elsewhere.
The border fence between Gaza and Israel has cameras, ground-motion sensors and regular army patrols.The border fence between Gaza and Israel has cameras, ground-motion sensors and regular army patrols.
The barbed-wire topped fence is supposed to have been a "smart barrier" to prevent exactly the sort of infiltration that has taken place in this attack.The barbed-wire topped fence is supposed to have been a "smart barrier" to prevent exactly the sort of infiltration that has taken place in this attack.
But Hamas militants simply bulldozed their way through it, cut holes in the wire or entered Israel from the sea and by paraglider.But Hamas militants simply bulldozed their way through it, cut holes in the wire or entered Israel from the sea and by paraglider.
How is the US involved?
America is Israel's closest ally, and successive administrations have declared the US' "iron-clad" commitment to Israel's security.
In the wake of the Hamas attack, the US announced it was moving an aircraft carrier, ships and jets to the eastern Mediterranean, and that it would also give Israel additional equipment and ammunition.
As well as a show of support towards Israel, the move could be a warning to the powerful Lebanese militant group, Hezbollah - an enemy of Israel and supporter of Hamas - not to attack Israel.
At least 14 US citizens - along with victims from about 16 countries, excluding Israel - have been killed in the Hamas attack. A number of US citizens are also among the dozens of people being held hostage by Hamas in Gaza.
What happened in 1973, and why are people comparing it to Hamas' latest attack?
Some are comparing the Hamas attack with what Israelis refer to as the Yom Kippur War of 1973. Almost exactly 50 years ago, Israel was caught in a surprise attack by Egypt and Syria on the Jewish holy day of Yom Kippur.
The Arab forces made significant advances before Israel's were able to repel them.
In the war, 2,656 Israeli soldiers were killed, and thousands more were wounded. On the Arab side, some 18,000 were killed and tens of thousands were wounded.
The fact that Israel was caught off-guard and suffered so many casualties made a deep impact on the Israeli psyche, and its subsequent focus on military preparedness convinced Israelis that such an event could never happen again.
How might Israel and the Arab world respond?
Hamas military commander Mohammed Deif has called on Palestinians and other Arabs to join the militants' operation to "sweep away the [Israeli] occupation".
It is not clear whether Palestinians in the occupied West Bank and East Jerusalem or elsewhere in the region will heed his call, according to the BBC's Jerusalem correspondent Yolande Knell.
Israel undoubtedly sees the potential for a war that could open up on multiple fronts.
One worst case scenario would see the involvement of Lebanon's Hezbollah movement.
Since the attack, the Iran-backed militant group has launched a number of missiles and shells at northern Israel. Israeli forces have responded by attacking Hezbollah positions and other infrastructure.
The Israeli military has ordered a massive reinforcement of troops and is expected to launch a ground offensive on the Gaza Strip soon.
It says 300,000 personnel including recently-mobilised reservists are near the Gaza border "ready to execute the mission we have been given".
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