MILWAUKEE, Wis. — At least 6 people were killed following an apparent shooting at the headquarters of Molson Coors Beverage Company (formerly known as MillerCoors.)

Authorities said 51-year-old Anthony Ferrill opened fire at the Molson Coors Brewing Co. complex on Wednesday, killing five male employees before turning his gun on himself. His motive remains a mystery; police say the case is still under investigation. They also haven’t released details about how the shooting unfolded.

Milwaukee police Chief Alfonso Morales said the victims were all from the Milwaukee area. He identified them as Jesus Valle Jr., 33, of Milwaukee; Gennady Levshetz, 61, of Mequon; Trevor Wetselaar, 33, of Milwaukee; Dana Walk, 57, of Delafield; and Dale Hudson, 60, of Waukesha.

President Donald Trump addressed the shooting before speaking at the White House with reporters about steps his administration is taking to combat the coronavirus. He said the attacker killed five people and wounded others.

Police tweeted that there was no longer an active threat. Authorities did not immediately release details about the shooter or how the shooting unfolded.

It occurred at a sprawling complex that includes a mix of corporate offices and brewing facilities. At least 600 people work at the complex, which is widely known in the Milwaukee area as “Miller Valley,” a reference to the Miller Brewing Co. that is now part of Molson Coors.

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.

The Associated Press contributed to this story.