Grammy-winning rapper T.I., who was freed after months in prison, was back in federal custody Thursday because of a flap over his use of a luxury bus to report to a halfway house, his lawyer said. Steve Sadow told The Associated Press that the Federal Bureau of Prisons "has moved T.I. to a different facility" because of an issue involving the rapper's 375-mile trip Wednesday from the Arkansas lockup to Atlanta in a gleaming motor coach. He did not elaborate on the exact nature of the problem federal authorities had, but said it was not drug-related. He said they are trying to resolve the problem. T.I., whose real name is Clifford Harris, traveled with an entourage to check into the halfway house, stepping off the bus clad in a red and blue striped polo shirt and white shirts. "There appears to be confusion surrounding the method of transportation," Sadow said. Federal authorities had no further information late Thursday night where Harris was taken. Traci Billingsley, a spokeswoman for the Federal Bureau of Prisons, told the AP that she couldn't comment on the rapper's status or his immediate whereabouts. T.I. had initially served about seven months at the prison in 2009 after he was arrested for trying to buy unregistered guns and silencers from undercover federal agents. He was on probation after he was released and ordered not to commit another crime or to illegally possess any controlled substances.