On Saturday night a train from Doncaster bound for London was dramatically diverted after an alarm was raised on board. A man armed with a large knife, who is believed to have joined the train at Peterborough, carried out a vicious attack on multiple victims. Within 20 minutes a suspect had been arrested in Cambridgeshire, more than 70 miles from the train’s intended destination of King’s Cross in London.

Eleven people were treated in hospital, where one person remains in a stable but critical condition. The BBC has spoken to train passengers and stabbing victims alongside video and police statements to build a picture of how the attack and the emergency response unfolded.

The attack started just over an hour after the LNER train left Doncaster. At 19:29 it had pulled out of Peterborough station, where the suspect had apparently boarded. Just five minutes later the alarm was pulled near the middle of the train in coach J.

Amira Ostalski and a friend, both students at Nottingham University, had got on the train at the previous stop of Grantham and were travelling to London to “have some fun”.

Amira was seated watching a film when she saw a man in a white shirt leap out of his seat about five rows in front of her followed by screams of “knife, knife”. Amira then spotted a man holding a large kitchen knife and fled towards the rear of the train with her friend.

In the next carriage, coach H, YouTuber Olly Foster heard shouts of “run, run, there’s a guy literally stabbing everyone”, and initially thought it was a Halloween prank. But as passengers began pushing through the carriage Olly could see “blood all over the chair” he had leaned on, covering his hand in blood.

Olly then saw an older man, thought to be an LNER staff member, who “blocked” the attacker from stabbing a younger girl, leaving him with a gash on his head and neck.

Nottingham Forest fan Joe, 24, was not meant to be on the train. He had watched the team’s football match against Manchester United earlier and missed a connecting train in Grantham.

Joe was texting his friends about his plans for the night when people came rushing through the carriage. “You need to run, you need to run,” someone told Joe. He started running but when he turned to look behind him saw “a tall black male” holding “a bloodied knife”.

Matt Kingston took his headphones out as he saw a group of people heading his way in coach H and also began running down the train. Another Nottingham Forest fan Alistair Day, 58, was next to the train’s cafe bar in coach G, and saw people fleeing down the train with blood on their clothes.

The train’s cafe bar transformed into an impromptu hiding space for those fleeing the attacker. Alistair said he saw around a dozen people inside this enclosed buffet counter in coach G and they were “trying to close up the shutters” to protect themselves from the assailant. Matt had managed to get inside the booth with the others.

Alistair saw the man near the door waving a knife and trying to open the shutters, which by then had been locked. A video he provided to the BBC from inside the cafe bar shows multiple passengers inside, with at least one on the phone to emergency services. Alistair and another witness, Tom McLaughlan, told the BBC they saw a Nottingham Forest fan move to confront the attacker. “He wasn’t the biggest guy. We tried to stop him,” Alistair said.

It appears they were referring to Stephen Crean who later told the BBC the man pulled out a large knife when he confronted him outside the cafe bar. “He’s gone for me and there was a tussle in the arms and that’s where my hand, the fingers are really bad, four cuts through them, sliced. And then he raised it and must have caught me when I was ducking and diving and caught me on the head.”

Stephen said he had been trying to give another passenger time to close the door to the cafe bar. “That door still wasn’t shut behind me, because I could still see him struggling to close it. So until I knew it was I wasn’t moving away from it.”

Matt said the attacker then walked past the locked door while waving the knife around. “He then returned back up the train and passed us again.” At that point a young man told Matt he’d been stabbed in the chest “so I helped with putting pressure on the wound and helped hold him up”.

Another victim of the train attack was Scunthorpe United footballer Jonathan Gjoshe, who was slashed across the bicep and later needed an operation.

As soon as the alarm was raised the train driver, Andrew Johnson, a Royal Navy veteran, sprang into action and contacted the control centre. The decision was made to divert the train, which was travelling at 125mph (201km/h), to a slow track, which allowed it stop at Huntingdon Station just minutes after the emergency services were first called.

The East of England Ambulance Service received the first emergency call at 19:38. A minute later, Cambridgeshire police received a report about multiple stabbings on a train. Together, they mobilised a response team outside Huntingdon Station, just under 300m away from the police force’s headquarters. At 19:41 the train arrived at the station, a minute before British Transport Police were also called to the incident.

CCTV footage captured by a business in its car park shows passengers running up platform two towards the main station building. A dramatic TikTok video, filmed from a bridge on Brampton Road overlooking the rail tracks and station, shows police officers running towards the train along the same platform.

Tom saw two men who appeared to have been stabbed “covered in blood” as he fled the train. Alistair said he saw a man who had been in the cafe bar with him being carried towards an ambulance by paramedics. “I just want to know he’s okay,” he said.

Emergency services took 10 people to hospital where a further victim was treated. Six patients have since been discharged.

The LNER staff member who remains in a critical but stable condition “undoubtedly saved people’s lives” by trying to stop the attacker, British Transport Police said.

CCTV footage shows a man climbing a fence at the station at 19:43 to an adjacent car park while holding a knife.

Amira, who had been hiding at the back of coach G armed with a metal tray to fight off the attacker if necessary, had run to the car park with her friend for safety when they got off the train.

But they saw the man walk in their direction. Fearing for their lives, they hid in a taxi. An image captured by Amira’s friend through its windscreen shows the man being detained by six police officers near several bins in the car park, around 50m (160ft) from the fence.

Video filmed from a separate taxi nearby shows the officers armed with guns, Tasers and accompanied by a dog detaining a man on the ground. Clicks from the Taser are audible in the footage.

By 19:50 police had two men in custody, 32-year-old Anthony Williams, and a 35-year-old man who was released a day later after police established he was not involved. On Monday morning Williams appeared in court charged with 10 counts of attempted murder over the train attack.

Additional reporting by Adam Durbin.