Feds watching possible terror plot for NY, D.C.

U.S. officials said Thursday they were investigating a credible but unconfirmed threat that al Qaeda was planning to use a car bomb to target bridges or tunnels in New York City or Washington to coincide with the 10th anniversary of the Sept. 11 attacks, the first tip of an "active plot" around that date. Law enforcement officials were investigating three people who recently entered the U.S. The threat was received by the U.S. intelligence community late Wednesday night, officials said. "There is specific, credible but unconfirmed threat...