NORTH SEWICKLEY TOWNSHIP, Pa. -- A Beaver County girl is set to have surgery Friday for injuries suffered in a car crash Monday in North Sewickley along Route 65.

In the meantime, police are still searching for the driver who they believe caused the accident.

Corrin Murphy, 11, and her sister, Autumn, 9, were both injured in the crash. The girls are being treated at Children's Hospital in Pittsburgh for broken bones and dislocations.

A third girl who was injured in the crash was treated and released.

Police said the four girls were in a car with their uncle, who was allegedly speeding at the time of the crash. According to investigators, after the crash, the driver, Ronald Newton, 34, fled on foot, taking his girlfriend's 9-year-old daughter with him.

Police found the other three girls on the road.

"It's very unfair," said the girls' mother, Davie Murphy. "They're laying here in a hospital, and he's out there doing his thing."

"I have a lot of mixed emotions," said the girls' father, Allan Murphy. "They only time my anger really comes out is when I hear them scream in pain."

The girl Newton took from the scene was treated at the hospital Monday night, but it's unclear how she got there.

“He needs to turn himself in; take care of it like a man like he should. Just take care of it, the longer he runs, the harder it’s going to be on him,” said Allan Murphy.

Newton is facing a long list of charges including four counts of reckless endangerment and four counts of failing to render aid.

Anyone with information on his whereabouts is asked to call police.