Pennsylvania ? A pre-dawn fire engulfed a western Pennsylvania home where three generations of the same family lived Thursday, killing 10 people, most of them children, while the patriarch worked an overnight shift.

Authorities identified the dead as a 40-year-old woman and nine people under 20, including two infants. Most of the younger ones were children or grandchildren of the woman, Kimberly Peterson.

Two members of the family escaped, including a young woman who jumped from the second floor and ran naked and screaming for help, officials said. The roaring flames melted the siding on a neighboring house.

Fire Chief Kris Benson said the front of the house was ablaze when he arrived at 2:50 a.m. and tried to enter through a side door but was forced back by smoke and flames.