Police are responding to reports of an active shooter at a commercial building in Middleton, Wisconsin.
The Middleton Cross Plains School District initiated a lockdown for all of its schools, district spokesman Perry Hibner said. The motive for the shooting was not immediately known.
"Police officers are on scene at this time", the Middleton Police Department said in an emergency message.
A spokeswoman for University Hospital said four patients were brought in with what appear to be gunshot-related wounds - one of them in critical condition, and a possible fifth victim with minor injuries was reported at another hospital. She says she ran out of the building and hid behind a vehicle.
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We spoke to employees who work at a building next door who said they saw employees running from the WTS Paradigm building. The 46-year-old Stubbs says she had to explain to the officer she was campaigning.
According to the Dane County Communications Center, dispatch received multiple reports of an active shooter in the 1800 block of Deming Way. She said: "We're all software people".
CNN reports that an unidentified gunman is believed to have opened fire in an office building in the Middleton, a Madison suburb west of Milwaukee. "We have a good group".
'I saw a dude walking with a gun inside the building, ' King said.
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The address includes businesses Esker Software and WTS Paradigm.
Keely Arthur of CNN affiliate WISC said about 50 police cars and the Federal Bureau of Investigation are at the scene.
Check back for updates on this developing story.
Images from the scene show armed police surrounding the building.
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