VAN NUYS (CNS) – Authorities continue their efforts to determine the cause of a fire at a Van Nuys house in which a man was found dead.

Firefighters were sent to the 14000 block of Archwood Street at 3:58 a.m. on Feb. 27, according to Margaret Stewart of the Los Angeles Fire Department.

Firefighters extinguished the flames in the 3,276-square-foot structure, which was built in 1992, in 26 minutes, Stewart said.

“While conducting a primary search for victims, firefighters found one person beyond medical help,” Stewart said in a statement on Tuesday, March 1.

“The home was recently purchased, and it is believed the occupant (had) just moved in. Smoke alarms were present, but it is not known if they were functional.”

The dead man was identified as 56-year-old Artak Grigoryan of Van Nuys, said coroner’s Lt. Larry Dietz. The cause of death was not immediately known.

Fire officials initially said the home was vacant and was known to be occupied by squatters, but later determined the person who died was not a squatter but had recently moved in to the home.

Stewart said three firefighters suffered non-life-threatening injuries battling the blaze. Two were taken to a hospital in fair condition and and one was treated at the scene and released, Stewart said.