Investigators say that the driver of the bus in a fatal crash on Sunday night fell asleep at the wheel.

The crash happened near Scranton, Pennsylvania.

The lone death was 33-year old Rebecca Blanco, a Cornell University alum. She was a 2017 masters graduate from California.

Another person was critically injured.

An Ithaca newspaper says the driver is cooperating with the investigation and no charges have been filed yet. He has not been identified by Pennsylvania troopers.

The bus was operated by Ithaca-based Big Red Bullet.