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| Four held amid UK terror alerts | Four held amid UK terror alerts |
| (10 minutes later) | |
| Police are now holding four people following an attack on Glasgow Airport that is being linked to the discovery of two car bombs in London's West End. | Police are now holding four people following an attack on Glasgow Airport that is being linked to the discovery of two car bombs in London's West End. |
| The UK has moved to its highest level of terror alert - critical - after a burning car crashed into the airport. | The UK has moved to its highest level of terror alert - critical - after a burning car crashed into the airport. |
| Two men were arrested, one who is in hospital with severe burns, after Saturday's attack, and two arrests were made on the M6 in Cheshire overnight. | Two men were arrested, one who is in hospital with severe burns, after Saturday's attack, and two arrests were made on the M6 in Cheshire overnight. |
| Police are searching several houses in Glasgow over the three attacks. | Police are searching several houses in Glasgow over the three attacks. |
| "We can confirm that, as part of the ongoing enquiry into the incidents at Glasgow airport and London, a number of houses in the Renfrewshire area are being searched," a police statement said. | "We can confirm that, as part of the ongoing enquiry into the incidents at Glasgow airport and London, a number of houses in the Renfrewshire area are being searched," a police statement said. |
| A witness told Reuters news agency they saw officers wearing white overalls, coming in and out of a semi-detached house in the town of Houston, about six miles (nine km) from Glasgow. | A witness told Reuters news agency they saw officers wearing white overalls, coming in and out of a semi-detached house in the town of Houston, about six miles (nine km) from Glasgow. |
| 'Critical condition' | 'Critical condition' |
| An eyewitness to the arrests, Peter Whitehead told BBC News 24 that three cars straddled the motorway and brought traffic to a halt. | An eyewitness to the arrests, Peter Whitehead told BBC News 24 that three cars straddled the motorway and brought traffic to a halt. |
| "It turned out they were unmarked police cars. In front of them were a couple of other unmarked police cars and they forced a car onto the hard shoulder and got the occupants out and as far as I can see arrested them," he said. | "It turned out they were unmarked police cars. In front of them were a couple of other unmarked police cars and they forced a car onto the hard shoulder and got the occupants out and as far as I can see arrested them," he said. |
| Passengers and staff were evacuated from the airport Airport attack was terrorism Your pictures: Glasgow alert | Passengers and staff were evacuated from the airport Airport attack was terrorism Your pictures: Glasgow alert |
| Counter-terrorism police made the arrests hours after Strathclyde police had confirmed they were linking the attack in Glasgow with events in London. | Counter-terrorism police made the arrests hours after Strathclyde police had confirmed they were linking the attack in Glasgow with events in London. |
| Chief Constable Willie Rae said: "There are clearly similarities, and we can confirm that [the Glasgow attack] is being treated as a terrorist incident." | Chief Constable Willie Rae said: "There are clearly similarities, and we can confirm that [the Glasgow attack] is being treated as a terrorist incident." |
| Two men were arrested at Glasgow Airport, which is in Paisley, after their Jeep Cherokee crashed into the main doors and burst into flames. | Two men were arrested at Glasgow Airport, which is in Paisley, after their Jeep Cherokee crashed into the main doors and burst into flames. |
| One of the suspects suffered severe burns and was taken to the city's Royal Alexandra Hospital, where he is said to be in a critical condition. | One of the suspects suffered severe burns and was taken to the city's Royal Alexandra Hospital, where he is said to be in a critical condition. |
| Strathclyde Police had believed he was in possession of "a suspect device", but it was later found not to be explosive. | Strathclyde Police had believed he was in possession of "a suspect device", but it was later found not to be explosive. |
| The vehicle involved has been made safe and will be examined by forensic experts. It is expected to be removed later on Sunday morning. | The vehicle involved has been made safe and will be examined by forensic experts. It is expected to be removed later on Sunday morning. |
| 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. | 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. |
| In the light of the attacks, the national terrorism threat level was raised to "critical" on Saturday after a meeting of the government emergencies committee, Cobra. | In the light of the attacks, the national terrorism threat level was raised to "critical" on Saturday after a meeting of the government emergencies committee, Cobra. |
| The critical threat level, the highest one possible, indicates terrorist attacks are 'imminent'. | |
| 'CRITICAL' THREAT LEVEL Critical - an attack is expected imminentlyIt is the highest of five threat levels under the new system which begun in August 2006It can be based on intelligence but in this case is understood to have been raised because previous attacks suggest riskIt is the second time the UK has been 'critical' under new systemThe threat levels are a tool for security practitioners working in different sectors | 'CRITICAL' THREAT LEVEL Critical - an attack is expected imminentlyIt is the highest of five threat levels under the new system which begun in August 2006It can be based on intelligence but in this case is understood to have been raised because previous attacks suggest riskIt is the second time the UK has been 'critical' under new systemThe threat levels are a tool for security practitioners working in different sectors |
| BBC home affairs correspondent Danny Shaw said the decision to raise the level to critical reflected concern that those responsible have the capability and intent to carry out further bombings. | BBC home affairs correspondent Danny Shaw said the decision to raise the level to critical reflected concern that those responsible have the capability and intent to carry out further bombings. |
| He said the similarities between the attacks suggested they were carried out by the same individuals or by members of the same cell. | He said the similarities between the attacks suggested they were carried out by the same individuals or by members of the same cell. |
| All flights to and from Glasgow Airport were suspended after the attack on Saturday. | All flights to and from Glasgow Airport were suspended after the attack on Saturday. |
| The airport reopened to incoming flights at 0737 BST when a plane from Ibiza landed, and the first departure is expected at 0900 BST. | The airport reopened to incoming flights at 0737 BST when a plane from Ibiza landed, and the first departure is expected at 0900 BST. |
| And a number of other airports stepped up security, including Edinburgh, Newcastle, Birmingham, Manchester and Blackpool. John Lennon Airport in Liverpool was closed while a suspicious vehicle was removed for examination, but has now re-opened. | And a number of other airports stepped up security, including Edinburgh, Newcastle, Birmingham, Manchester and Blackpool. John Lennon Airport in Liverpool was closed while a suspicious vehicle was removed for examination, but has now re-opened. |
| Security has also been tightened at airports across the US. | Security has also been tightened at airports across the US. |
| CCTV footage | CCTV footage |
| In a televised statement on Saturday, Prime Minister Gordon Brown urged the public to remain vigilant. | In a televised statement on Saturday, Prime Minister Gordon Brown urged the public to remain vigilant. |
| "I know the British people will stand together, united and resolute," he said. | "I know the British people will stand together, united and resolute," he said. |
| He also thanked the police, the security and emergency services for their "dedicated professionalism" in Glasgow and London. | He also thanked the police, the security and emergency services for their "dedicated professionalism" in Glasgow and London. |
| Police in London are checking CCTV footage in their investigation into the planting of the two car bombs. | Police in London are checking CCTV footage in their investigation into the planting of the two car bombs. |
| Police have been increasing patrols and security for events in London over the weekend, including the Gay Pride parade on Saturday, the Concert for Diana at Wembley Stadium on Sunday and the ongoing Wimbledon tennis championships. | Police have been increasing patrols and security for events in London over the weekend, including the Gay Pride parade on Saturday, the Concert for Diana at Wembley Stadium on Sunday and the ongoing Wimbledon tennis championships. |
| Police have urged anyone with information to phone the confidential Anti-Terrorist hotline number on 0800789321. | Police have urged anyone with information to phone the confidential Anti-Terrorist hotline number on 0800789321. |