Trains Collide in Washington, D.C., No Injuries Reported

WASHINGTON -- A freight train and a MARC passenger train collided outside Union Station, but neither train had passengers and no one was seriously injured.

D.C. fire department spokesman Pete Piringer says the trains "bumped" shortly after 9 a.m. Friday but did not overturn. He said four or five train operators were being evaluated but that their injuries did not appear to be serious.

It was unclear how the accident happened.