Los Angeles, California (CNN) -- A fire at a condominium building in Escondido, California, killed one person early Saturday after engulfing four units, a police spokesman said.
Two of the units sustained heavy damage before the fire was contained about 5 a.m. (8 a.m. ET), Escondido police spokesman Lt. Craig Carter told CNN.
Authorities are working to identify the victim, Carter said.
The cause of the fire is under investigation.
CNN's Shirin Rajaee contributed to this report.