Six people have died after a shooting at Milwaukee’s Molson Coors brewing facility on Wednesday afternoon. All were brewery employees, including the gunman.

Milwaukee police responded to reports of an active shooting shortly after 2:00 p.m., according to the Milwaukee Journal-Sentinel. The brewing facility’s sprawling campus was put on lockdown shortly thereafter.

In total, five victims were killed, and there were no reported injuries.

The shooting occurred during what is typically a shift changeover time, according to Molson Coors employee Randy Chenoweth, who told WISN TV that he was “15 to 20 feet away” when the gunman opened fire.

While initial reports described the shooter, a 51 year-old Milwaukee man, as a recently-fired employee of the brewing facility, Milwaukee Police Chief Alfonso Morales identified him instead as an active employee, who died of a self-inflicted gunshot wound while still in his work uniform.

Molson Coors’s chief executive, Gavin Hattersley, later confirmed that the gunman was an active employee, adding, “there are no words to express the deep sadness many of us are feeling right now.”

No motive for the shooting has yet been offered by Milwaukee police, who have also declined to release further details about the victims or the shooter.

In a press conference Wednesday evening, Milwaukee mayor Tom Barrett called Wednesday the “saddest day” in the landmark 165 year-old brewing facility’s history.