Four people were injured, one of them critically, when a heavily armed employee opened fire Wednesday morning in the offices of a software company in Middleton, Wisconsin, authorities said.

Police shot and killed the gunman, who hadn’t been identified.

Middleton Police Chief Charles Foulke said police received calls of a shooting at 10:25 a.m. (11:25 a.m. ET) at a complex housing several businesses. The shooting occurred in the offices of WTS Paradigm, a business products software company, where “officers engaged the suspect, and he was shot by officers,” Foulke said.

University of Wisconsin Medical Center in Madison said that one patient was critically wounded and that two others were in serious condition. A fourth person was grazed by a bullet and suffered minor injuries, police said.

The gunman was “heavily armed, with a lot of extra ammunition,” Foulke said. Two Middleton police officers and two Dane County sheriff’s deputies shot the man, who later died at a hospital, he said.

Foulke said it was clear that the officers “prevented a lot more bloodshed from happening.”

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