NEW YORK - (AP) - New York City Mayor Michael Bloomberg says aterror threat against the city is credible but not corroborated.

U.S. officials said Thursday they were investigating a detailedal-Qaida car bomb plot aimed at bridges or tunnelsin New York or Washington.

Bloomberg says the New York Police Department is deployingadditional resources to keep residents safe ahead of the 10thanniversary of the Sept. 11 terror attacks on Sunday. He says thecity's 9/11 observance will go ahead as planned.

Police Commissioner Raymond Kelly says he's increasing thetowing of illegally parked cars. He says there will be an increasedfocus on bridges and tunnels.

Information gleaned from Osama bin Laden's compound in Pakistanin May indicated al-Qaida had considered attacking the UnitedStates on the 10th anniversary of the Sept. 11 attacks and otherimportant dates.AP source: Specific, unconfirmed threat received