Four people are dead after a bus and a train collided in Biloxi, Mississippi, officials said Tuesday evening. The bus, which was carrying up to 60 people, was crossing a Biloxi train track when it became stuck. While the bus driver attempted to reverse off the tracks, the bus was struck by a CSX freight train. Thirty-five passengers were hospitalized, seven of whom have critical injuries, officials said. None of the train’s crew was injured. Biloxi authorities are investigating how the bus became trapped on the train tracks.