(NBC News) Pennsylvania authorities say they know who opened fire on two Pennsylvania State Troopers at their barracks late Friday, killing one and critically injuring another.
Police describe 31-year-old suspect Eric Matthew Frein as armed and extremely dangerous.
After four days and nights of road blocks and searches the lead came after a resident walking his dog in the woods approximately two miles from the barracks came across a vehicle partially submerged in a retention pond and called 911.
“We processed the vehicle and we found evidence, shell casings and other things that matched shell casings we found at the Blooming State Grove Station,” Pennsylvania State Police Commissioner Frank Noonan said.
Police say they have learned that Frein has had military-like survivalist training and had expressed anti-government views to friends and family.
“He has made statements about wanting to kill law enforcement officers and also to make mass acts of murder,” Noonan said.
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