JOHANNESBURG – Police have arrested two men suspected of torching Putco buses in Mpumalanga.Fifty-one buses were set alight at four different bus depots, and the motive behind the attack remains unclear.READ: 50 Putco buses torchedProvincial government officials are expected to visit the crime scenes today, to assess the extent of the damage.The arson attack has disrupted the daily commute of thousands of passengers, but Putco says it will continue its operations under supervision.