Ask any insurance carrier what is the "safest color" vehicle to drive...which is MOST likely to stand out in a human's field of vision.......WHITE and YELLOW...I think the eyewitnesses are offering what their brains registered and remembered...
Bowie Maryland shooting...police found the SPOT the sniper was shooting from..."flattened" grass...this too did not involve a vehicle.
But Washington Times reported on both Tuesday and Wednesday that a white van had been seen leaving the scene of the Bowie shooting.