A 28-year-old Prince George’s County, Maryland police officer died Sunday after what authorities have called an “unprovoked attack” outside a police station.

Officer Jacai Colson had been with the department for four years. He died at a hospital Sunday night after he was shot while he and other officers were “going about their business” outside the department’s District Three station, Chief Hank Stawinski said.

“It wasn’t about anything,” Stawinski told reporters Sunday night.

It appears that the gunman fired at the first officer he saw, then continued to exchange gunfire as other officers responded, Stawinski said. In addition to Colson’s fatal wound, the gunman was also shot. He was expected to survive.

Roads were briefly closed and residents told to shelter in place as officers sought a second suspect, who Stawinski said fled the scene during the shooting. He was taken into custody after a search of the area, and police were questioning him Sunday night.

The suspects’ names were not immediately released, and police said there was no known motive for the shooting.

Police gathered for a press conference Sunday night outside the hospital where Colson had been treated. Fraternal Order of Police president John Teletchea described Colson as a friend.

“Jacai had an infectious smile,” he said. “He lit up a room.”

Colson had been working as an undercover narcotics officer, and Teletchea said he was dedicated to protecting the community.

“He was a real cop’s cop, didn’t shy away from any calls.”

State’s Attorney Angela Alsobrooks described Colson’s death as an “act of cowardice” that would be prosecuted as murder.

“This is a crime against the community, and we will treat it as such,” she said.

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