The drivers of two tour buses were seriously injured in a collision on Ohio Drive SW this morning, near the Tidal Basin. The accident took place at 10:30 a.m. It looks like one of the buses was parked when the second bus crashed into it head-on, according to D.C. Fire/EMS spokesperson Pete Piringer. There were no passengers on board either bus, but one of the drivers was trapped and emergency crews were working to cut open the bus in order to free him. Both men appear to have sustained life-threatening injuries.