Officials chase unconfirmed al-Qaida bomb threat

WASHINGTON (AP) — 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 today, causing a major traffic backup. National Guard troops and transit police carrying assault rifles watched the crowds at Penn Station.