US counter-terrorism officials are pursuing a credible but unconfirmed al-Qaida threat to set off a car bomb on bridges or tunnels in New York or Washington.

US counterterrorism officials are chasing a credible but unconfirmed al-Qaida threat to use a car bomb on bridges or tunnels in New York City or Washington.

US counterterrorism officials are chasing a credible but unconfirmed al-Qaida threat to use a car bomb on bridges or tunnels in New York City or Washington.