London Security Crackdown Targets Transit
Travelers in for increased delays
By Sam Biddle,  Newser Staff
Posted Jul 2, 2007 4:55 AM CDT
Passengers line up at Glasgow International Airport in Scotland, Sunday July 1, 2007. Four terrorist suspects were in custody Sunday after a flaming jeep was driven into Glasgow International Airport...   (Associated Press)
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(Newser) – British police are cracking down on security at rail services and airports to thwart terror attacks in the wake of a trio of car bomb attempts over the weekend. No specific intelligence warns of an attack on the subway system or the rail network, but the increased patrols and security checks are a precaution, according to a transport police boss.

Armed patrols have been stepped up at Heathrow and the London City airports following the explosion at the Glasgow airport , and travelers nationwide are no longer allowed to drive directly to the doors of an airport. All travelers have been told to expect delays while the national threat level is at "critical."