DETROIT (AP) — Police may put the brakes on a party bus that was apparently operating as a Sunday strip club for reveling Lions fans at a popular tailgating spot in Detroit.

Investigators believe fans tailgating before a recent Lions home game were allowed onboard the “Booty Lounge,” a large red and black bus replete with two stages, steel dancing poles, tinted windows and even a smoke machine, after forking over a $10 donation to its operators, Detroit Police spokeswoman Eren Stephens said Thursday.

She said the department’s chief, Ralph Godbee, thinks the arrangement is illegal, but that the department won’t take action until it completes its investigation. The Lions’ next home game is Oct. 10 against the Chicago Bears.

“We know the game is coming up and … we’re looking into this whole operation,” Stephens said.

Police began investigating after WDIV-TV broadcast a story about the bus this week. The station reported that the bus was parked next to Detroit’s Eastern Market, which is a popular tailgating spot that is about a half-mile from Ford Field, where the Lions play.

The bus operators, who didn’t respond to email and phone requests seeking comment, say on their Facebook page that the bus can be hired for private parties and is available with or without “ladys,” adding that “our opinion is that it is a lot more fun with em!”