The extent of the injuries weren't immediately known, but those wounded had been transported to a hospital. The incident took place at Esker Software on September 19 with reports about the attack coming at around 10:30 a.m. local time, reports the Wisconsin State Journal.
WMTV reports victims were transported to University of Wisconsin hospital.
Judy Lahmers, a business analyst at WTS Paradigm, said she was working at her desk when she heard shots at around 10 a.m. "You just wonder:'Do you hide or do you run?"' she said.
A black legislative candidate says she feels humiliated after Madison police stopped her while she was campaigning door-to-door and questioned her. We're all software people.
NBC15 was told the suspect walked into the building and opened fire.
Still, Stubbs says she felt humiliated and degraded. She said the building's glass entrance door shattered.
Images from the scene show armed police surrounding the building.
Reports say police were called after a woman was seen fleeing the scene with a gunshot wound. There are stores and restaurants affected. This information is not confirmed by police.
The ATF's St. Paul division tweeted that they are "responding" to the scene.