A man accused of stabbing four people while on an Amtrak train in Niles has pleaded not guilty to attempted murder charges. Bond was set at one-million dollars for Michael Williams of Saginaw during his arraignment in Berrien County court. The 44-year-old appeared by video from jail and requested a court-appointed attorney. Williams is accused of stabbing a conductor and three other people when the train stopped at the Niles depot on Friday night. According to court documents, Williams used a hunting knife with a five-inch blade during the attack. Police say the train conductor was stabbed several times, including twice in the head and neck. At one point, police say Williams told them a person he was talking to on the train “turned into a demon and he had to fight them.” All four victims remain in stable condition.