Pennsylvania state troopers
Pennsylvania state troopers patrol the streets near Pittsburgh's David L. Lawrence Convention Center, the site of a Group of 20 Summit, Sept. 25, 2009. Reuters

UPDATE 7:15 p.m.: A Pennsylvania state trooper who was killed in an ambush Tuesday has been identified as Cpl. Bryon Dickson of Dunmore, the Associated Press reported. Dunmore was a seven-year veteran and had transferred to the region from the Philadelphia barracks.

The trooper who survived the attack was identified as Trooper Alex Douglass. He was reported in critical but stable condition following surgery.

Original post:

Pennsylvania authorities are searching for a suspect or suspects Saturday who killed one state trooper and wounded another in a late-night shooting Friday. The two troopers were ambushed during a shift change.

“This has been an emotional night for all of us,” Pennsylvania State Police Commissioner Frank Noonan said at a press conference Saturday morning, according to the Scranton Times-Tribune. Law-enforcement agencies from New York and New Jersey are assisting Pennsylvania authorities in the search for the suspect.

The two troopers’ names have not been released. They were shot at the front door of the state police barracks in Blooming Grove around 10:50 p.m. EDT. The wounded trooper was taken to the Geisinger Medical Center in Scranton, about 35 miles from the barracks.

The barracks are located in a wooded area, according to the Associated Press. “There’s a lot of rural area up where they patrol,” Pennsylvania State Police representative Adam Reed told AP.

Noonan said authorities don’t have a description of the suspect or suspects, but he said they are pursuing leads. He urged the public to be aware of any suspicious activity. “We can’t say that the situation is completely in hand,” he said.

The slain trooper was the second to be killed in Pennsylvania in the last five years, according to the Times-Tribune. Trooper Joshua Miller was shot and killed after a high-speed chase in 2009.