LATEST: Lily Allen has "no idea" why her U.S. work visa was revoked, dismissing reports it's a result of her March (07) arrest for attacking a photographer. The Smile singer was detained by customs and immigration officials in Los Angeles on Sunday (05Aug07), as she flew in from Australia for the MTV Video Music Awards nominations party on Tuesday (07Aug07). Early reports suggested officials were alerted by Allen's arrest in London. She was cautioned for the incident after voluntarily attending a police station in June. But Allen insists the two events are unrelated. A statement released by her record label EMI states the singer "has no idea why she was singled out for such treatment". EMI insists it is hopeful of securing her work visa in time for her scheduled U.S. gigs next month (Sep07).