New London — Firefighters extinguished a fire Tuesday night in a first-floor apartment at 239 Nautilus Drive.

Battalion Chief Jeffrey Rheaume said a mattress fire in a first-floor unit caused no injuries, but resulted in substantial damage to the unit. The tenant in that unit was relocated and is staying with family.

A call initially came in reporting smoke coming from a storage unit on the third floor of the apartment building, he said. Firefighters investigated and found the mattress fire in an apartment on the first floor. There was heavy smoke throughout the apartment building as firefighters searched for the fire.

The blaze was reported at about 9:44 p.m. and brought under control at 10:10 p.m., Rheaume said. It is under investigation by the New London fire marshal's office, he said.

All on-duty New London Fire Department units responded Tuesday, along with the Naval Submarine Base fire department.