A teenager who suspected her ex-boyfriend had taken another girl to the high school prom has been charged with setting fire to his family's house in Trenton, displacing 10 people, police said.

Shanta Dargbeh of Bristol Township, Pa., faces 10 felony charges including aggravated arson.Dargbeh, 19, was upset at hearing her boyfriend may have taken another date to last weekend's Trenton High School prom, said Trenton police spokesman Detective Captain Joseph Juniak.

The boy is among Stanley and Teresa Johnson-Davis' eight children.

Nine members of the family were home when the early morning fire consumed the house. They escaped through windows and down a fire escape. Two were treated for smoke inhalation, police said.

Dargbeh is in the Trenton lockup, her bail set at $250,000.