Since this a commercial motorbus, NTSB regulations forbid the movement of the vehicle while bodies remain on board and/or the crash investigation is underway.
Literally within the last 30 minutes per KLIF radio interview with the Dallas Cty Sheriff, the NTSB and Homeland Security gave permission to local officials to move the bus with bodies still on board to a remote location for the investigation to expedite opening the frwy for the evac.
That is good news. Good ole Ankarlo.