Counterterrorism officials are chasing a credible but unconfirmed tip that al-Qaida has plans to set off a car bomb in New York City or Washington around the Sept. 11 anniversary, with bridges or tunnels as potential targets. It was the first word of a possible "active plot" timed to coincide with commemoration of the terror group's attacks a decade ago.
Police in New York and Washington increased their already stepped-up staffing levels. In New York City, authorities were stopping vehicles at the 59th Street bridge Friday, causing a major traffic backup. National Guard troops and transit police carrying assault rifles watched the crowds at Penn Station.
White House officials said President Barack Obama had no plans to change his scheduled trips to New York's ground zero, the Pentagon and Shanksville, Pa., on Sunday to mark the anniversary. This latest threat "should not surprise any of us," Secretary of State Hillary Rodham Clinton said during a speech in New York. Telling the public "is intended to enlist the millions and millions of New Yorkers and Americans to be the eyes and the ears of vigilance," she said.