VALLEJO, Calif. -- Northern California police say a woman set herself on fire inside her home last weekend, killing herself and her twin 14-year-old daughters.
Vallejo Police Captain Lee Horton said Thursday that 47-year-old Mau Dao's suicide also injured her 11-year-old daughter.
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Detectives are investigating the case in the San Francisco Bay Area as a suicide that resulted in two homicides, according to police.
The 11-year-old girl is reportedly with her father and expected to recover.
"It is horrible how they died," family friend Angelo Galvez said. "This is not what they deserved."
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Authorities say the girl who survived was outside the house engulfed in flames Sunday and flagged a nearby Vallejo police officer.
They say firefighters brought out the woman and her two daughters but one of the twins died at the scene. The other teenager died at a hospital along with her mother.
The Associated Press contributed to this report.