The emergency room director at Aspirus Langlade Hospital confirmed to WSAW News that the hospital treated three patients following the shooting.
Only parents are being allowed to the scene of the incident to reunite with their children, NewsChannel 7 reported, citing investigators.
At least three people have been injured, one of them critically, in a shooting incident at Antigo High School in northern Wisconsin, according to local officials. Local media say the school is currently on lockdown.
The shooting was confirmed by the Langland County sheriff to WSAW News.
The incident took place at around 11:00 p.m. local time (0400 GMT) at the end of the prom, BNO news reported.
At least three people, have been injured in the shooting, and one of them is in critical condition, Lt. Jamie Lenzer of the Antigo Fire Department said, as cited by CNN.
Reports on social media said the school is currently on lockdown and the students are not being released until the area is secured.
3 injured, 1 critically in Wisconsin school prom shooting