Mayor: Terror threat against NYC credible

New York City mayor officials said they were investigating a detailed Al Qaeda car bomb plot aimed at bridges or tunnels in New York or Washington.Bloomberg says the New York Police Department is deploying additional resources around city to keep residents safe.Police Commissioner Raymond Kelly says hes increasing patrols and the towing of illegally parked cars. He says there will be more bomb-sniffing dogs on the streets and an increased focus on bridges, tunnels and other infrastructure.Information gleaned from Osama bin Ladens compound in Pakistan in May indicated al-Qaida had considered attacking the United States on the 10th anniversary of the Sept. 11, 2001 attacks and other important dates.Security has been enhanced around the country ahead of Sundays anniversary.