Law enforcement officials offered a more detailed description of the makeup of the failed car bomb found in Times Square on Saturday night, and said they were reviewing surveillance footage that showed a white man who appeared to be in his 40s walking away from the area as he looked over his shoulder and removed a layer of clothing.

Raymond W. Kelly, the New York City police commissioner, said on Sunday that the materials found in the Nissan Pathfinder -- gasoline, propane, firecrackers and simple alarm clocks -- also included eight bags of a granular substance, later determined to be nonexplosive grade of fertilizer, inside a 55-inch-tall metal gun locker.

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