A fire on board the nuclear-powered submarine USS Miami injured at least seven people at the Portsmouth Naval Shipyard, authorities announced Thursday.

The shipyard commander, Capt. Bryant Fuller, said at a press conference that among the injured were five firefighters who were dispatched to put out the blaze at the naval repair facility located on an island in Kittery, Maine.

The fire, which was extinguished, broke out Wednesday night. Authorities have not yet established how many people were on board the $900 million attack sub at the time.

The blaze continued all night but Fuller said that the sub's nuclear reactor was not damaged and that there were no weapons on board.

The flames erupted in the bow compartment, Fuller said, adding that all non-essential personnel were evacuated.

The USS Miami and her crew of 13 officers and 120 sailors arrived at the military shipyard on March 1 for repairs and modernization of some of the sub's systems.

This is the third submarine to bear the name of the city of Miami and the fifth improved Los Angeles class nuclear sub. The Miami entered into service on June 30, 1990, and its home port is Groton, Connecticut. EFE