[originaltext] (3) (4) Authorities say at least 61 people have killed and so

(3) (4) Authorities say at least 61 people have killed and some 120 others injured during a train collision in eastern India. Officials say the crash occurred early Monday, when a speeding express train slammed into a stationary train at Sainthia station in Birbhum district, about 200 kilometers north of West Bengal’s state capital, Kolkata.
    The force of the crash was so strong that the roof of one car flew into the air and landed on an overpass above the tracks. Rescue workers pulled victims from the mangled wreckage, and heavy lifting equipment was later brought in help clear the tracks.
    Authorities are investigating how the high-speed train came to be on the same track as the stationary train. Indian Railway Minister Mamata Banerjee refused to rule out the possibility of sabotage, but other officials said there was no evidence of foul play.
3. How did the accident happen?
4. Which of the following statements best describes the condition of the passengers?