By Jim Melwert, Steve Beck, Dray Clark

UPPER DARBY, Pa. (CBS) — Two Upper Darby Township police officers ran into a burning home, rescuing a young girl, but the fire claimed the life of her 41-year-old mother.

The two officers were on routine patrol when they saw smoke and flames coming from a home on the 3800 block of West Marshall Road around 11:30 p.m. Tuesday.

The officers called the fire into dispatch, and then ran into the burning home.

They were able to rescue a four-year-old girl. A 41-year-old woman, identified by police as Onya Safo, was also pulled from the fire, but she was pronounced dead at the scene.

The four-year-old girl is in serious condition at Crozer-Chester Medical Center.

Authorities say both of the officers were treated for smoke inhalation.

The cause of the fire remains under investigation.