The fire broke out in the Philadelphia area

US: Fire breaks out in seniors' community, 20 injured

A high-speed train ran into another one that was stationary and unoccupied at the 69th Street Terminal in the city's Upper Darby suburb

Train crash in Philadelphia, at least 42 injured

Clinton, who is vying to be the first woman elected US president, called her nomination "a milestone"

Hillary accepts Democratic nomination, casts herself as a catalyst for change

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