Former Student, 18, Shot Dead After Opening Fire Outside Wisconsin Prom and Wounding 2: Police
04/24/2016 AT 02:50 PM EDT
Jakob E. Wagner was armed with a rifle when he allegedly began shooting outside the Antigo High School prom, on school grounds in Antigo, about 11 p.m. local time, police said in a statement obtained by PEOPLE.
One male and one female were wounded by gunshots as they left the building, police said in the statement. Patrolling officers, already on school grounds, responded to the shots and one officer fired back at Wagner, who died from his injuries early the next day.
The female victim was treated for one gunshot wound and released, according to the statement; and the male victim was undergoing surgery Sunday morning for non-life-threatening injuries.
Donald Childs, an administrator with the Unified School District of Antigo, tells PEOPLE that the male victim was a student at the school who is undergoing surgery on his leg. The female victim was his date, from out of state, and was grazed in the shooting, Child says.
Want to keep up with the latest crime coverage? Click here to get breaking crime news, ongoing trial coverage and details of intriguing unsolved cases in the True Crime Newsletter.
Police said in the statement they believe Wagner was a lone shooter, according to their initial investigation, and are executing a search warrant of his residence.
Wagner was a former student at Antigo High, a police source tells PEOPLE. Childs described Wagner as "a sometime student." He was armed with one rifle and ammunition and there is no known motive, at this time, for the shooting, the police source says.
In a statement on Facebook Sunday, the school district said that counseling services will be available in all schools on Monday.
"We are thankful police and staff acted quickly together to prevent this incident from becoming a major tragedy," the district said.
The investigation is ongoing, police said.