ANTIGO, Wis. — An 18-year-old man opened fire with a rifle outside of a high school prom in northern Wisconsin, wounding two students before a police officer in the parking lot fatally shot him, authorities said Sunday.

Investigators did not say whether they believe the two students were specifically targeted or discuss a possible motive for the shooting.

But a school administrator said it appeared that the gunman – identified by police as Jakob E. Wagner – intended to go into the dance and start shooting randomly.

The two prom-goers were shot as they left the building, according to Eric Roller, the chief of police in Antigo, a community of about 8,000 people roughly 150 miles north of Milwaukee.

“Officers were in the parking lot patrolling the activities and heard the shots and an officer immediately fired upon the shooter, stopping the threat,” Roller said. He said the gunman was taken into custody and died at a hospital.

The Unified School District of Antigo said Wagner approached the school with a high-powered rifle and a large ammunition clip. The district said the “quick actions” taken by police and district staff to secure the building “prevented what might have otherwise been a disaster of unimaginable proportions.”

Interim district administrator Donald B. Childs said Sunday that it appears Wagner intended to go into the building and shoot at people at the dance.

“We have no reason to believe at this point it was targeting anybody specifically,” Childs said, adding that the shooting outside the entrance happened “from some distance.”

The female victim was treated and released and the male victim was undergoing surgery for injuries that weren’t life-threatening, police said. Childs said the wounded boy, who was shot in the leg, attended the high school but that his date, who was grazed in the shooting, was from out of state.

Gov. Scott Walker praised the police response, saying the actions of the Antigo Police Department “undoubtedly saved lives.”

Friends said Wagner was a senior at Antigo High School in 2015, but Childs said he did not graduate with his classmates and was continuing to work on his diploma. He said the school of about 750 students will have counselors available when classes resume Monday.

Dylan Dewey, who graduated from Antigo High last year, said Wagner had been dating a girl at the school who broke up with him last month. He described Wagner as an “all-around good guy” who enjoyed hanging out with friends.