One killed in D.C. commuter train collision

At least one person was killed Monday in a rush-hour collision between two Metro transit trains in northeast Washington.

A number of other passengers were severely injured, said District of Columbia fire spokesman Alan Etter, in what he describes as a "mass casualty event." He said crews were cutting apart the trains to get people out.

The collision happened about 5 p.m. EDT - the height of the city's rush hour – on the Metro system's red line near the Washington-Maryland border.