British Prime Minister Gordon Brown has called another meeting of the country's top security committee, after two men rammed a burning four-wheel-drive vehicle into the main terminal building at the airport in Glasgow, Scotland.
Glasgow police arrested two men, but have not identified them. They apparently were inside the vehicle when it hit the glass front doors of the airport terminal. The incident comes one day after police found and disabled two potentially deadly car bombs in London.
Mr. Brown chaired an earlier meeting of ministers and top security officials Friday in response to the failed car bomb plot. It is not clear if the London car bombs and the Glasgow incident were related.
Investigators said the London bombs were similar to those used by al-Qaida-linked groups in attacks in other countries. Officials are reviewing video from security cameras to see if they can learn who drove and then abandoned the two Mercedes sedans found on Friday.
In Glasgow, all flights at the airport have been canceled. No injuries were reported in Saturday's incident, although witnesses said one of the men who fled the vehicle was on fire. He and his companion were arrested after a brief scuffle with police.
British Home Secretary Jacqui Smith says the government is doing everything possible to keep the public safe. There is increased security around Parliament and major events around London.
British authorities searched cars arriving for the tennis championship at Wimbledon, and they reviewed security plans for a Sunday concert at Wembley Stadium in honor of the late Princess Diana.
In Washington, the White House said it had ordered security tightened at some U.S. airports.
Britain is about to mark the second anniversary of an attack on the London transit system July seventh. Four Muslim suicide bombers set off explosions that killed 52 bus and subway passengers.