BLOOMING GROVE, Pa. (AP) — Two troopers were ambushed outside a state police barracks in northeastern Pennsylvania during a late-night shift change, leaving one dead and another injured, and authorities were searching Saturday for the suspect or suspects, state police said.

One trooper was leaving the barracks in Blooming Grove, Pike County, and another was arriving when shots were fired at 10:50 p.m. Friday, State Police Commissioner Frank Noonan said. He confirmed that one trooper was killed and the other was injured and taken to Geisinger Medical Center in Scranton, where he was in stable condition after undergoing surgery.

Noonan provided few details on the shooting but said the attack seemed to be directed at state police.

"This has been an emotional night for all of us," he told reporters.

Law enforcement officials from across the region, including New York and New Jersey, descended on northeastern Pennsylvania to help with the search on foot and by helicopter. The Blooming Grove barracks is in a wooded area, surrounded by state game lands.

Noonan said authorities did not have a description of the shooter or shooters but said they were following several leads.

"We can't say that the situation is completely in hand," he said.

Noonan said police did not believe the general public was at risk, but they are asking everyone to be on the lookout for anything suspicious.

"People in the area can come and go freely but should be alert," he said.

Several roads around the barracks, including parts of Interstate 84, were closed Saturday morning. Blooming Grove is a township of about 4,000 people about 35 miles east of Scranton.

Trooper Adam Reed, a state police spokesman, said the Blooming Grove barracks covers most of Pike County, which runs along the Delaware River and borders New Jersey and New York.

"There's a lot of rural area up where they patrol," he said. "As the primary police force in the county, they're going to respond to anything and everything."