Investigators are searching for a survivalist accused of shooting two Pennsylvania State Troopers outside of their police barracks during a shift change.
Multiple law enforcement agencies are looking for Eric Matthew Frein.
Investigators say he ambushed the state troopers, killing one and injuring another.
The Commissioner for the Pennsylvania State Police says Frein is extremely dangerous, and has a lot of training.
Frein has made statements about wanting to kill law enforcement officers, and commit mass acts of murder, according to the commissioner.