Witness reports seeing man loading gun outside of Waukesha County Health and Human Services Center

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WAUKESHA, Wis. (CBS 58) -- The Waukesha County Sheriff's Office was called to the Waukesha County Health and Human Services Center on Tuesday afternoon.
A witness called 911 around 11:41 a.m. to report that a man was loading a handgun inside his vehicle in the visitor parking lot.
The center went into lockdown and officers found the man in the parking lot.
He was taken into custody without incident.
A grenade was found in the trunk of his car.
The Milwaukee County Sheriff EOD was called out and determined the grenade inert.
It's unclear if a gun was also found.
The Waukesha County Sheriff's Office says they don't believe the man was intending to commit an act of violence at the Health and Human Services Center.
The incident remains under investigation.
Stay with CBS 58 News for more information on this developing story.