[Read the latest on the shooting]

MILWAUKEE — In a city renowned for its brewing tradition, the sprawling Molson Coors campus was an icon in itself, a place known for decades to Milwaukee locals as the old Miller Brewery. But on Wednesday afternoon, officials said, a worker still in his uniform stormed the facility and began shooting.

He killed five people, all fellow employees.

“It’s frightening,” said Representative Gwen Moore, a Democrat whose district includes Milwaukee, and whose congressional office includes a Miller High Life sign. “It’s anathema to the kind of culture that we expect. This is heartbreaking because Milwaukee is a very friendly city.”

The police chief, Alfonso Morales, said the gunman, a 51-year-old from Milwaukee, killed himself after the attack. Hours after the shooting, the police were continuing to search the more than 20 buildings on the Molson Coors campus, where about 1,000 people work. Late into the evening, some workers remained stuck inside the complex waiting for the police to finish their search and clear the workers to go home.