SAN FRANCISCO - San Francisco transportation officials say driver error appears to be the cause of a crash involving a light-rail train and a historic streetcar.

Municipal Transportation Agency spokesman Judson True says the Muni Metro train ran into the back of a streetcar around 6:20 a.m. Thursday.

Two passengers on the light-rail train were taken to the hospital. Their injuries were described as non-life-threatening.

halle, belgium (cnn) -- belgian authorities were holding a crisis meeting tuesday morning in the aftermath of a commuter train crash near brussels that left 18 people dead and more than 160 injured. officials from belgium's military, the fire

A commuter train ran through a red signal and ploughed into an inter-city express train near the suburban station of Buizingen, nines miles from Brussels. The force of the collision smashed one train deep into the front of the other, tearing back the metal sides and "totally destroying" one carriage.

The impact peeled away the front of one leading train carriage and threw at least one other across the tracks, littering the rails with bodies.

Reporting from Washington -- A rush-hour collision between two crowded trains on Washington's subway system killed at least six people this evening and injured dozens, trapping commuters in a stack of twisted rail cars that rescuers were still searching hours later.

Witnesses say a train near the Ft. Totten station on the Metro's busy Red Line was rear-ended by another train, which climbed atop the stopped cars ahead of it, leaving a two-level snarl of debris. The operator of the approaching train, whose name was not immediately released, was among the dead, authorities said.