Authorities say seven people have been killed and 70 injured in a subway train collision in Washington DC .

The city's mayor Adrian Fenty held a press conference where he revised an earlier reported death toll of nine. Carriages of one of the trains came to rest on top of the other after the collision near a station during a rush hour, officials said. The female driver of the moving train - which crashed into the back of a stationary train - was among the dead. The crash - the worst in the 33 years of the Metro system - happened above ground between Fort Totten and Takoma at 1700 local time (2200 BST). Passenger Jodie Wickett told CNN she had been sitting on one of the six-car trains, sending text messages on her phone, when she felt the impact.

She said: "From that point on, it happened so fast, I flew out of the seat and hit my head." Ms Wickett said she stayed at the scene and tried to help. She added: "People are just in very bad shape. The people that were hurt, the ones that could speak, were calling back as we called out to them. "Lots of people were upset and crying, but there were no screams." President Barack Obama said in a statement: "Michelle and I were saddened by the terrible accident in north-east Washington DC . Our thoughts and prayers go out to the families and friends affected by this tragedy.

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