Wisconsin officials: Shooting suspect's mental health background not reported by South Dakota

MIDDLETON, Wis. (KSFY)- Investigators say South Dakota officials never reported the mental health history of a man suspected of opening fire inside a Wisconsin business, injuring four people.

Deming Way in Madison, Wisconsin at the scene of a possible active shooter, Photo Date: 9/19/2018 / Photo: WMTV / MGN

WMTV reports Wisconsin officials said Monday that Anthony Tong was diagnosed with paranoid schizophrenia. If it had been reported to the national database, a background check would have caught that Tong could not own a firearm.

It is unclear which agency is responsible for reporting that information.

In this case, Tong's weapon was self-built, which makes it largely unregulated.

South Dakota revoked Tong's conceal and carry permit in 2004 after police were called to his Sioux Falls apartment and found a cache of weapons.

He was killed by police during the attack back in September. Four officers have been on paid leave since the shooting, and they will not be charged for Tong's death.