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Kathy Willens, Associated Press
A community affairs officer checks on a woman living in the neighborhood of a house that was damaged in an arson attack near the Imam al-Khoei Islamic Center, which was also attacked, in New York, Monday, Jan. 2, 2012. Police are investigating a string of attacks in the area as possible bias crimes.

NEW YORK — A surveillance camera video shows a New York City house being firebombed in what police are investigating as a possibly linked series of bias crimes.

The video shows a car pulling up Sunday night. Someone suddenly appears, lifts his right arm high and hurls a lit object that strikes the house and explodes into flames.

Earlier Sunday evening, the entrance to a globally prominent Islamic cultural center also was struck by two Molotov cocktails, the types of bombs usually made of glass bottles filled with flammable liquid and corked with rags.

Two other attacks also occurred. No one was injured.

Mayor Michael Bloomberg says police hate crimes unit detectives are investigating.

No arrests have been made. Police released the video and a sketch of a suspect Monday night.