Three people -- all believed to be students -- have been killed, six other people are injured and a suspected shooter is in custody after a shooting at Oxford High School in Oxford Township, MI, on Tuesday, authorities said.

The shooting happened around 12:55 p.m. in the section of the school where many history classes take place, WDIV reports.

Police said they responded to the active shooting situation with multiple patrol and EMS units, along with SWAT and aviation units.

The Oakland County Sheriff’s Office confirmed that one suspected shooter is in custody, and officials recovered a handgun, they said.