The rapper, who denies the allegation, was placed in jail and then released several hours later but remains under investigation. AMERICAN rapper Nelly has been arrested after a woman claimed he raped her in his tour bus. The alleged sexual assault reportedly took place hours after he had performed at a concert near Auburn, less than 20 miles south of Seattle in Washington State. The singer was detained early on Saturday morning in the bus at a Walmart in Auburn. He was placed in jail and then released from custody several hours later but remained under investigation. Nelly, whose real name is Cornell Iral Haynes Jr, was scheduled to perform in Ridgefield, Washington, on Saturday night.…