Authorities say two men were killed and a third survived a gunshot to the head after an armed fight broke out at a large apartment complex in Marin City, north of San Francisco.

Marin County Sheriff's Office spokesman Lt. Doug Pittman said the violence began on Sunday with a domestic dispute in which other people tried to intervene.

Pittman told the Marin Independent Journal he did not know whether the victims were shot or might have died from other injuries. He said authorities initially received reports of gunfire and a possible altercation involving people with bats or sticks.

The survivor was taken to a hospital with a gunshot wound to his head.

His condition improved by the afternoon.

Investigators were trying to determine what happened and planned to interview the survivor to get details.