An alleged incident aboard a Rio-bound British Airways flight while it was still on the ground at London's Heathrow Airport has British police investigating a claim that Oasis frontman Liam Gallagher groped a female member of the plane's staff, the airline has confirmed to Reuters. "On the evening of Friday, January 12, a male passenger was allegedly abusive to a female member of staff prior to boarding flight BA 2247 to Rio," said a spokeswoman. "The member of staff has reported the alleged incident to police and they are investigating. Clearly, we will provide the member of staff with any support she needs." A spokesman for Oasis had no comment, while police said, "Inquiries are continuing into the allegation." In the past, Gallagher, 28, has reportedly received warnings about cocaine possession. He was also once arrested for smashing a photographer's camera and paid a fan about $100,000 after head-butting him.