State Police are investigating a crash on the Mass. Ave. Bridge around 2:30 p.m. that left a motorcyclist dead.

State Police released few details except that the motorcycle rider was a 20-year-old man who was pronounced dead at the scene and that driver of the SUV is being treated for "emotional distress."

Doug, who took this photo, said the SUV "had major front damage and airbag deployment."

Another view from the WBZ helicopter.

The driver of a Boston-bound 1 bus eventually executed a U-turn to get back to Cambridge: