Police are responding to a report of an active shooter in Middleton, Wisconsin.
The call came in around 10:25 a.m. on Wednesday, Sept. 19.
Madison.com said its reporter, Dean Mosiman, was quoted as saying that "there were at least 40 police squad cars and ambulances from multiple jurisdictions outside the building".
No details on the situation have been released by authorities.
"Please lock all doors, stay inside and shelter in place", the Middleton Police Department said Wednesday.
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Cops in bulletproof vests and Federal Bureau of Investigation agents were seen arriving shortly after a perimeter was established outside the business, which sits in a suburb of the city of Madison.
It is also unclear whether the shooter is still on the loose, although one unconfirmed report said they had been taken into custody.
The Greenway Station shopping center next door to the office building is on lockdown.
Andrew King, an employee at TrafficCast, 1800 Deming Way, said he saw a man carrying a handgun inside the 1850 Deming Way building. She provided no additional information.
This is a developing story and we will update it once more information is received.