york affiliate wgrz. we'll have more on the protests in the next half hour and the debate whether the u.s. is turning into a police state. don't miss that. now the conductor on an amtrak train is one of four people stabbed while traveling from chicago to michigan. no one was killed in friday's incident, but the condition of the victim is unknown right now. reports say the suspect is a 44-year-old man from michigan. >> i heard somebody screaming and yelling, just loud noises yelling. i look up and there's an african-american gentleman standing over somebody who is sitting down in one of the first seats in the car, and i've seen him have his fist up and i bring it down. >> the investigation on that story is still ongoing. still to come on cnn, rolling stone has backed off its college rape story, saying the accuser's story has crumbled.