Officials say a man suspected of killing four people aboard a Chicago-area transit train shot them at close range while they were asleep. The shooting took place before 5:30 a.m. Monday aboard the Chicago area’s L system. It happened on a Blue Line train that was moving near where the line ends in the suburb of Forest Park. A suspect was later arrested on another Chicago Transit Authority L line, according to police. Forest Park Mayor Rory Hoskins told The Associated Press on Tuesday that the victims likely didn’t even see the shooter. Authorities filed first-degree murder charges against a 30-year-old man.