The terror network has long sought to attack the U.S. again, and Obama adviser John Brennan says the latest information is specific and from a credible source.
Brennan says investigators are trying to "put the pieces together" and be vigilant. He tells "Fox News Sunday" that the government, in his words, "is taking this very seriously." Investigators have chased a tip that al-Qaida may have sent three men to the U.S. on a mission to detonate a car bomb in either Washington or New York. But officials have said they've found no evidence al-Qaida has sneaked anyone into the country.White House takes possible terror threat seriously
WASHINGTON (AP) - September 11, 2011
