Three juvenile victims were pronounced dead at the scene.
The Los Angeles Times reports the victims were two boys and a girl. Deputies reportedly first responded to a call about two children who were not breathing, but when they arrived they found three kids who were not breathing.
The children's mother, Sandra Chico, was taken into custody as a person of interest on Monday. On Tuesday, she was arrested, the Los Angeles Times reports.
There was reportedly another person in the residence when deputies arrived, and law enforcement officials believe that person telephoned for help.