NEW YORK — Officials say several firefighters were hurt and several buildings were damaged after an upper-floor apartment in a historic New York City district caught fire and the blaze spread to neighboring buildings.

Fire officials say the blaze broke out Tuesday night in in Manhattan’s historic SoHo district. It then spread to a penthouse above and jumped to nearby buildings on both sides.

Fire officials say at least three buildings were damaged. The fire proved difficult to knock down due to the age of the buildings and the methods in which they were built.

Four firefighters were being treated for heat exhaustion. There were no reported civilian injuries, although two pets had to be rescued.

The cause of the blaze is under investigation.