Authorities are still looking into what caused a car to crash into a Central Square School bus.

State police say it happened after school Monday at the intersection of Barker and Shanty Creek Roads.

About 15 to 20 elementary school students were on board -- none were hurt. The bus driver also wasn't injured.

The driver of the car was taken to the hospital where he remains in critical condition.

Rescue crews had to pry the roof off of the car to get him out.

Investigators are interviewing witnesses and looking at surveillance video in the area.