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The fire broke out just before 10 a.m. on the second floor of a residential building at 38th Street and soon spread to the buildings on both sides.

Thirteen firefighters suffered minor injuries and some of them suffered from heat exhaustion.

"The gear, as you know, is very heavy. It keeps the heat in, so the operational time of our firefighters is reduced significantly, so we take precautions," said New York City Fire Department Deputy Assistant Chief John Sudnik. "We make sure that we call additional units on the scene very quickly, and that's what we did. We had additional personnel get on the scene, so we could relieve our firefighters to reduce the heat stress while they're operating."

FDNY officials said there is significant damage to the original building and to the roofs of the other two buildings, and water damage to all three buildings.

The cause of the fire is still under investigation.