A man accused of stabbing a conductor and three passengers on a US train has been charged with four counts of attempted murder.
The chief suspect in the attack, which took place in south-western Michigan, has been identified as Michael Williams, 44, of Saginaw.
According to Niles police chief Jim Millin, officers were alerted to a “suspicious person” on board the Amtrak train on Friday night.
When officers arrived at the depot in Niles, which is about 10 miles north of South Bend, Indiana, the attack was already under way.
Mr Millin said the officers pushed their way through fleeing passengers and confronted Williams, who was allegedly carrying a knife.
They used a stun gun to subdue him and took him into custody.
The four victims – three males and a female – were taken to Lakeland-Niles Hospital or Memorial Hospital in South Bend.
Niles mayor Michael McCauslin said the wounded included the train’s conductor, a female passenger and two male passengers.
Mr Millin said that although initial reports were that at least one of the victims was in serious condition, all four victims are in stable condition.
The train, which had been carrying 172 passengers, remained in Niles for hours after the attack while investigators gathered evidence and spoke to witnesses. It finally resumed its journey at 1.20am on Saturday.
He said: “They were there within seconds of this happening.
“It was pretty incredible that they may have saved some lives today.”
Fellow passenger Caitlin Cipri told reporters she was gathering her belongings prior to getting off the train when she heard screaming.
She initially thought the suspect was punching a passenger until she saw a knife handle. Ms Cipri said she then saw the man stab two other people.
She added: “It was terrifying, and you don’t think something like that is going to happen to you.
“It’s terrifying that things like this happen.”