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OCEAN CITY, N.J. (CBS) — A heavy fire damaged four homes in Ocean City, New Jersey, early Thursday morning. The fire sparked around 3:30 a.m. on the 4800 block of Central Avenue.

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The flames quickly spread to two duplexes before firefighters were able to get it under control.

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Firefighters from four other towns were called in to help.

The homes were not occupied and no injuries were reported.

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The cause of the fire is under investigation. Officials are checking nearby cameras.