MILWAUKEE (AP) — Police searched a home on Milwaukee’s north side Thursday as they hunted for clues about why an employee at one of the nation’s largest breweries gunned down five co-workers before taking his own life.

The house, a one-story home with a massive jungle-gym in the backyard, was roped off with crime scene tape Thursday morning. A squad car sat in the driveway and investigators were seen entering the home. Neighbor Erna Roenspies, 82, said the man who lives in the house has worked at the brewery for 15 years as an electrician.

The shooting happened Wednesday afternoon at Molson Coors Brewing Co.’s massive brewery complex in Milwaukee, which employs around 1,000 people. Authorities have said the shooter was a 51-year-old man from Milwaukee but haven’t released his name. Molson Coors CEO Gavin Hattersley said the shooter was “an active brewery employee.”

Authorities have offered no motive for the attack and have not released details about how the shooting unfolded. They also have not released the names of the victims.

The brewery complex includes a mix of corporate offices and brewing facilities. It’s widely known in the Milwaukee area as “Miller Valley,” a reference to the Miller Brewing Co. that is now part of Molson Coors. A massive red Miller sign towers over the complex and is a well-known symbol in Milwaukee, where beer and brewing are intertwined in the city’s history.

Officers worked for hours Wednesday to clear the more than 20 buildings in the complex where more than 1,000 people work. Police announced at a late evening news conference that the work was done and all employees had been allowed to go home.

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Associated Press reporters Carrie Antlfinger and Teresa Crawford in Milwaukee, Tim Sullivan in Minneapolis and Scott Bauer in Madison Wisconsin, and news researcher Rhonda Shafner in New York contributed to this report.