updated 12/21/2009 AT 3:00 PM ET
•originally published 12/21/2009 AT 3:25 PM ET
Amy Winehouse could be facing another police investigation for assault.
The British singer allegedly attacked a theater staffer at a holiday pantomime show in Buckinghamshire, England, on Saturday night, according to a report in the Sun newspaper.
The British newspaper says Winehouse, 26, became boisterous and shouted obscenities at the cast of a production of Cinderella, which included Hollywood actor Mickey Rourke.
Staff tried to usher her into a private box, but the singer allegedly kicked and punched front-of-house manager Richard Pound before being dragged out by her own security staff.
A Winehouse pal tells PEOPLE: “Amy was invited by a friend of hers starring in the show,” adding that no charges were brought against her. “She wasn’t arrested, and she hasn’t been questioned by the police yet.”
In a statement, Thames Valley Police confirmed that an incident occurred: “At around 9:05 p.m. on Saturday night officers were called to the Milton Keynes Theatre in Marlborough Gate, following reports that a 27-year-old man had been assaulted. No arrests have been made and the incident is being investigated.”