A group of customers at a Maryland bowling alley who refused to wear face masks assaulted two employees when they were asked to leave, police said.

A manager at Bowl America in Glen Burnie was knocked to the ground with a punch outside the bowling alley after escorting a group of eight men outside late Saturday, Anne Arundel police said.

The manager had just asked the men to put on face coverings — which are required at the facility — but they ignored the request. One of the bowlers then pushed the manager as they were asked to leave, police said.

“The manager then escorted the group of eight males outside,” police said in a statement.

“Once outside, one of the males punched the manager, causing him to fall to the ground.”

The other men in the group then kicked the manager while he was down. A second employee was then assaulted when he came to the manager’s aid, police said.

“It’s troubling,” Anne Arundel police spokesman Marc Limansky told WBAL-TV. “They were refusing to wear masks for their safety.”

The group refused to leave until the manager, who has not been identified, started to call 911, the station reported.

The suspects, described only as a group of black males, fled the bowling alley before cops arrived. No arrests have been made as of Wednesday in the ongoing investigation, police told The Post.

The manager was taken to a hospital with minor injuries, police said.

Anyone who witnessed the incident should call Anne Arundel police at (410) 222-6135.