A reporter from Madison.com counted at least 40 police cars and ambulances outside the building, which has been cordoned off.
About 50 police cars plus the Federal Bureau of Investigation responded to the scene in the 1800 block of Deming Way, Keely Arthur of CNN affiliate WISC reported. NBC15 reported that the office building appears to be the location of Paradigm Software.
CBS Madison reports that the Dane County dispatch center received several 911 calls about a possible shooter around 10:25 a.m. CST.
"There is an active shooter in the area please lock all doors, stay inside and shelter in place.Police officers are on scene at this time", the recording said.
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Images from the scene show armed police surrounding the building.
About 50 police cars plus the Federal Bureau of Investigation responded to the scene in the 1800 block of Deming Way, Keely Arthur of CNN affiliate WISC reported.
The Middleton High School, Kromrey Middle School and Clark Street Community School are on lockdown. Officials have asked people to avoid the area.
The gunman reportedly entered an office building in Middleton, Wisconsin, which is six miles north of the state capital, Madison.