A small explosion caused minor damage to a U.S. military recruiting center in New York's Times Square area in the early hours of Thursday but there were no injuries, police said.
NY1 television said a small bomb or incendiary device was thrown at the one-story building around 3:45 a.m. (0845 GMT), causing a small break in one of the windows.
Police said minor damage was caused to the building's door.
Nino Reyes, 26, told Reuters he had just opened his coffee and snack stand when he heard an explosion and saw a plume of red smoke shoot up and then turn black.
He said he saw three or four people running away.
Police closed off traffic in the streets around the busy tourist area between 42nd Street and 44th Street, and said a bomb squad was searching the area.
The building sits in a traffic island between Broadway and Seventh Avenue in Times Square, sometimes called the crossroads of the world. Police said the streets in the area would remain closed until the investigation was complete.
Subway trains were bypassing the busy Times Square subway station, NY1 said.
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