STORY: Mangled metal sits as dozens of investigators try to piece together how a passenger train collided with a double-decker city bus in Ottawa on Wednesday (September 18), killing at least six people.<br/> <br />The collision sheared off the front of the bus and caused the engine of the VIA Rail train to derail.<br/> <br />One bus passenger recalled the moments before the crash.<br/> <br />(SOUNDBITE) (English) UNIDENTIFIED BUS PASSENGER SAYING:<br/> <br />"The bus driver jammed on the brakes, his lights were all flashing, the thing was coming down and it just wasn't quick enough, I guess. (REPORTER ASKS: THE GATE WAS COMING DOWN?) "Yes. Oh yeah, the gate was down."<br/> <br />Ambulances and fire trucks swarmed the scene and transported dozens of injured people to area hospitals.<br/> <br />Officials say investigators are looking for the event recorder to find out how fast the bus was traveling.<br/> <br />Ottawa Mayor Jim Watson says the city's flags are at half-staff to mark the tragic loss of life.<br/> <br />(SOUNDBIT
