The sniper who participated in an attack that killed five officers and wounded seven others during a demonstration in downtown Dallas Thursday night has been identified.

Dallas authorities have declined to name the suspect, but a Texas law enforcement official told the Associated Press the suspect, who was killed last night in a standoff with officers, is 25-year-old Micah X. Johnson.

The Los Angeles Times reported that Johnson was a Dallas resident with family in the nearby suburb of Mesquite and that he had no known criminal history or ties to terror groups.

The military-focused publication Stars and Stripes reported that Johnson was an Army veteran , according to an Army spokesman.

The suspect, who fired at officers after they cornered him in a parking garage, died about 2 a.m. Friday when police used a robotic device armed with an explosive to kill the man, Dallas Police Chief David Brown said. He told officers he was acting alone, but police said investigators are still trying to identify other potential assailants. The chief declined to provide specifics, Yahoo reports.

“We’re going to keep these suspects guessing,” Brown said.