Updated 6:47 p.m. ET

Police are on the scene at the Molson Coors Beverage Company in Milwaukee after officials say a gunman opened fire on the campus Wednesday afternoon. Local officials say there are multiple fatalities but did not give a definitive figure.

“This remains an active scene,” Milwaukee Mayor Tom Barrett said at a late afternoon news conference. “There are multiple fatalities. We know that. The police department, the fire department have been working extensively.