FBI warns of possible attack on U.S. subways

The FBI warned U.S. transit operators that al Qaida could launch a nerve gas attack in a subway around July 4. News of possible attacks surfaced after analysts pieced together information from Afghanistan and a captured senior al Qaida leader, U.S. officials said Tuesday. The alert went out Friday and Saturday to major U.S. cities, including Washington and New York, they said. The officials stressed that the United States had no specific information about a pending subway attack.