The links between three terror attacks in Glasgow and London are becoming "ever clearer", says the UK's top counter-terrorism officer.
The links between three terror attacks in Glasgow and London are becoming "ever clearer", says the UK's top counter-terrorism officer.
Deputy Assistant Commissioner Peter Clarke said he was "absolutely confident" of uncovering detail of the attackers' methods and network.
Deputy Assistant Commissioner Peter Clarke said he was "absolutely confident" of uncovering detail of the attackers' methods and network.
A green Jeep driven into Glasgow Airport on Saturday has been linked to two failed car bombs in London.
A green Jeep driven into Glasgow Airport on Saturday has been linked to two failed car bombs in London.
Five people have been arrested - in Cheshire, Liverpool and at the airport.
Five people have been arrested - in Cheshire, Liverpool and at the airport.
Searches are taking place of addresses in Liverpool, Staffordshire, and near Glasgow.
Searches are taking place of addresses in Liverpool, Staffordshire, and near Glasgow.
BBC correspondent Daniel Sandford said police were believed to still be looking for other suspects.
BBC correspondent Daniel Sandford said police were believed to be looking for other suspects.
"I'm confident - absolutely confident - that in the coming days and weeks we will be able to gain a thorough understanding of the methods used by the terrorists, of the way in which they planned their attacks, and of the network to which they belong," said Mr Clarke.
Mr Clarke said: "The investigation into these attacks is extremely fast-moving. It is no exaggeration at all to say that new information is coming to light hour by hour."
"I'm confident - absolutely confident - that in the coming days and weeks we will be able to gain a thorough understanding of the methods used by the terrorists, of the way in which they planned their attacks, and of the network to which they belong."
He said forensic searches of vehicles were proving "extremely valuable" and thousands of hours of CCTV were being sifted through.
He said forensic searches of vehicles were proving "extremely valuable" and thousands of hours of CCTV were being sifted through.
Strathclyde Police issued the registration number of the jeep used in the airport attack - L808 RDT - and appealed for information about sightings of the vehicle in recent weeks.
Assistant Chief Constable John Malcolm said the force was receiving about 100 calls an hour from the public.
"This reflects the outrage felt in our communities at this act, and the calls we are receiving are supportive of the police actions," he said.
Controlled explosion
Controlled explosion
Earlier Prime Minister Gordon Brown said the UK would not yield despite the threat from people associated with al-Qaeda.
Earlier Prime Minister Gordon Brown said the UK would not yield despite the threat from people associated with al-Qaeda.
The government's emergency response unit, Cobra, has held its fourth meeting in three days.
The government's emergency response unit, Cobra, has held its fourth meeting in three days.
Home Secretary Jacqui Smith will make a statement on the situation in the Commons on Monday.
Home Secretary Jacqui Smith will make a statement on the situation in the Commons on Monday.
Scotland Yard said two people arrested on the M6 in Cheshire overnight - a 26-year-old man and 27-year-old woman - have been brought to London for questioning.
Scotland Yard said two people arrested on the M6 in Cheshire overnight - a 26-year-old man and 27-year-old woman - and another 26-year-old man arrested in Liverpool, have all been taken to London for questioning.
A spokesperson said Merseyside Police had arrested a 26-year-old man and were searching two addresses in the Liverpool area.
Merseyside Police are searching two addresses in the Liverpool area.
Glasgow - Burning car driven into doors of Glasgow Airport on Saturday. Two people arrested at scene London - Two car bombs that failed to detonate found in central London on FridayPaisley - Controlled explosion carried out on car at Royal Alexandra HospitalCheshire - Man and woman arrested overnight on M6, then taken to London for questioningLiverpool - Man arrested. Police searching two addressesHouston - Police searching houses in village near GlasgowNewcastle-under-Lyme - Police searching house in Staffordshire
Glasgow - Burning car driven into doors of Glasgow Airport on Saturday. Two people arrested at scene London - Two car bombs that failed to detonate found in central London on FridayPaisley - Controlled explosion carried out on car at Royal Alexandra HospitalCheshire - Man and woman arrested overnight on M6, then taken to London for questioningLiverpool - Man arrested. Police searching two addressesHouston - Police searching houses in village near GlasgowNewcastle-under-Lyme - Police searching house in Staffordshire
Staffordshire Police said its officers were involved in searches of addresses in Newcastle-under-Lyme with the West Midlands Counter Terrorism Unit and Met personnel.
Staffordshire Police said its officers were searching an address in Newcastle-under-Lyme with the West Midlands Counter Terrorism Unit and Met personnel.
One of the suspects held at Glasgow Airport suffered severe burns and was taken to Royal Alexandra Hospital, in Paisley, where he is said to be in a critical condition.
One of the suspects held at Glasgow Airport suffered severe burns and was taken to Royal Alexandra Hospital, in Paisley, where he remains in a critical condition. There is an armed police guard around the suspect.
A controlled explosion was later carried out at the hospital on a car, thought to be connected to the attack on Glasgow Airport, police said.
A controlled explosion was later carried out at the hospital on a car, thought to be connected to the attack on Glasgow Airport, police said.
Searches have taken place at addresses in Houston, Renfrewshire, close to the airport.
Searches have taken place at addresses in Houston, Renfrewshire, close to the airport.
The UK has moved to its highest level of terror alert - critical - after the Jeep Cherokee, believed to have contained gas cylinders, crashed into the main doors of Glasgow Airport's main terminal and burst into flames.
The UK has moved to its highest level of terror alert - critical - after the Jeep Cherokee, believed to have contained gas cylinders, crashed into the main doors of Glasgow Airport's main terminal and burst into flames.
The Glasgow incident came after two Mercedes containing petrol, gas cylinders and nails were found outside the Tiger Tiger club in London's Haymarket and a nearby street on Friday, but the devices did not detonate.
The Glasgow incident came after two Mercedes containing petrol, gas cylinders and nails were found outside the Tiger Tiger club in London's Haymarket and a nearby street on Friday, but the devices did not detonate.
Glasgow Airport was fully opened at 1500 BST on Sunday, almost 24 hours after the incident.
Glasgow Airport was fully opened at 1500 BST on Sunday, almost 24 hours after the incident.
A number of other airports have stepped up security, including Heathrow, Edinburgh, Newcastle, Birmingham, Manchester and Blackpool.
A number of other airports have stepped up security, including Heathrow, Edinburgh, Newcastle, Birmingham, Manchester and Blackpool.
There is heightened security and a heavy police presence at Wembley Stadium, where up to 63,000 people are attending the memorial concert for Diana, Princess of Wales.
Security has also been tightened at airports across the US.
Security has also been tightened at airports across the US.
The prime minister told Andrew Marr on BBC One's Sunday AM it was "clear that we are dealing, in general terms, with people who are associated with al-Qaeda".
The prime minister told Andrew Marr on BBC One's Sunday AM it was "clear that we are dealing, in general terms, with people who are associated with al-Qaeda".
"It's obvious that we have a group of people - not just in this country, but round the world - who're prepared at any time to inflict what they want to be maximum damage on civilians, irrespective of the religion of these people who are killed or maimed are to be," Mr Brown said.
"It's obvious that we have a group of people - not just in this country, but round the world - who're prepared at any time to inflict what they want to be maximum damage on civilians, irrespective of the religion of these people who are killed or maimed are to be," Mr Brown said.
Police have urged anyone with information to phone the confidential Anti-Terrorism hotline number on 0800789321.
Police have urged anyone with information to phone the confidential Anti-Terrorism hotline number on 0800789321.
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