US Senate Majority Leader Harry Reid was treated for minor rib and hip injuries after the vehicle in which he was riding was involved in an accident on a Las Vegas interstate highway on Friday afternoon, Reid's office said.The 72-year-old Democratic senator, who was wearing his seatbelt at the time of the accident, walked in on his own to the University Medical Center Hospital, his office said in a statement.He has been cleared for release from the hospital, the statement said. Some of Reid's security detail and a staffer also had minor injuries and were evaluated at the hospital, the statement added.