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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.

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

Firefighters from four other towns were called in to help.

The homes were not occupied and no injuries were reported.

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