MILWAUKEE (AP) — Milwaukee police say they have cleared out more than 20 buildings at one of the nation’s largest breweries after a gunman killed five employees there.

Authorities identified the assailant who attacked the Molson Coors complex on Wednesday as a 51-year-old Milwaukee man who worked there. Police say he died of a self-inflicted gunshot wound.

The shooting occurred at a sprawling facility that includes a mix of corporate offices and brewing facilities. More than 1,000 people work there.

By late evening, all employees had been sent home. Executives planned to close the complex for a time.

Multiple people were killed Wednesday in a shooting on the Molson Coors Brewing Co. campus, Milwaukee Mayor Tom Barrett said.

The dead include the shooter, said Barrett, who did not give an exact number of people killed in Wednesday’s shooting.

“What has happened is there was a horrific shooting that has occurred,” Barrett told reporters. “We’re urging all resident and people in this area to stay away from this area. … They’re continuing their sweep to make sure there is nothing more that’s occurring. It is a horrible, horrible day for the employees here. It’s a very rough day for anyone who is close to this situation.”

James Boyles told the Milwaukee Journal Sentinel that his wife, Lasonya Ragdales, works at Molson Coors in the claims department. She was texting from inside the facility and told her husband that there was an active shooter and she was locked in a room with a bunch of co-workers, the Journal Sentinel reported.