According to an eyewitness:
A POLICEMAN WANTED TO ARREST A BUS DRIVER SO HE JUMPED INSIDE THE BUS. THE DRIVER ON SEEING THAT THE POLICEMAN HAD JUMPED ON THE BUS WAS TRYING 2 SPEED OFF SO HE CULD B ABLE 2 SHAKE OFF THE POLICE OFFICER BY SO DOING HE LOST CONTROL OF THE BUS AND HIT A CULVERT, THE BUS SOMERSAULTED AND THE REST IS HISTORY..
I pray the bus driver lives to tell his own side of the story! see graphics pics below!