Six people are dead after a Molson Coors Beverage Co. employee killed five of his co-workers and then fatally shot himself during a rampage at the company’s Milwaukee campus yesterday.

The suspected gunman is a 51-year-old man who worked at the company, Milwaukee Police Chief Alfonso Morales told reporters during a news briefing. Morales did not identify any of the victims, pending family notifications.

Mayor Tom Barrett called the shooting a “tragic day for our city, a tragic day for our state.”

“Six families actually are grieving and will be grieving because of the horrific act of this individual,” he said. “Because there were individuals who went to work today just like everybody goes to work, and they thought they were going to go to work, finish their day and return to their families. They didn’t and tragically they never will.”

Milwaukee police responded to a “critical incident” at the campus after reports of a shooting just before 2:10 p.m., authorities said. The incident was treated as an active shooter situation.

The company tweeted about the “active situation” just before 2:30 p.m. and said: “There is an active situation at our Milwaukee facility and we are working closely with the Milwaukee Police Department. Our top priority is our employees and we’ll provide updates in conjunction with the police as we are able.”

Employees were alerted to the chaos through company text messages and emails.

The Milwaukee Police Department tweeted that a “critical incident” occurred near the 4000 block of W. State Street and asked for everyone to stay away from the area.

A company employee said they were told to shelter in place. Officers from the Milwaukee County Sheriff’s Office, Marquette University Police Department, the U.S. Marshals and other federal agencies also responded to the scene.

Molson Coors Beverage Co. had more than 1,000 employees working at the Milwaukee campus at the time of the shooting. The 160-year-old brewery is an iconic attraction in a city known for its brewing industry. Molson’s corporate offices will remain closed through the rest of the week and the brewery will be closed for an extended period. Molson acquired MillerCoors in 2016 and retired the beer brand.