Passengers travelling from Doncaster to London were attacked in a mass stabbing on a train on Saturday night.

Eleven people received treatment in hospital following the attack. One – a member of the train staff – is in a “critical but stable condition”.

Two British men in their 30s were initially arrested while police said there was “nothing to suggest” it was a terror incident.

Anthony Williams, 32, from Peterborough was charged on Monday with 10 counts of attempted murder.

The other man arrested has been released with no further action.

Witnesses reported that police used a Taser on one man who was holding a knife.

Prime Minister Sir Keir Starmer said the attack was “appalling” and “deeply concerning”.

Here is what we know so far about what happened.

Mr Williams, 32, has been charged with 10 counts of attempted murder, one count of actual bodily harm (ABH) and one count of possession of a bladed article following the knife attack, BTP said on Monday morning.

Police said he has also been charged with another count of attempted murder and possession of a bladed article in connection with an incident at Pontoon Dock DLR station in the early hours of the same day.

The ABH charge is in connection to an alleged assault in a custody suite on a police officer that allegedly resulted in a broken nose for the officer, following the incident at Huntingdon.

Williams, of no fixed abode, appeared at Peterborough Magistrates’ Court on Monday and was remanded in custody.

He is due to appear at Cambridge Crown Court on 1 December.

The attack took place on the 18:25 GMT London North Eastern Railway (LNER) service from Doncaster, South Yorkshire to London’s King’s Cross station.

Passengers said one person brandishing a knife began stabbing people on the train after it passed through Peterborough in Cambridgeshire.

Cambridgeshire Police received the first call from passengers on board at 19:39, and the British Transport Police (BTP) was also alerted at 19:42.

The train made an unscheduled stop at Huntingdon, which is around 15 minutes from Peterborough by train.

Armed police boarded the train and arrested the two men within eight minutes of the call to BTP. Police later said a knife was recovered from the scene.

A large emergency service response, including air ambulances, attended.

The driver of the train, who has since been identified as Andrew Johnson – a former Chief Petty Officer in the Royal Navy – contacted the control room from his cab to get the train diverted from the fast track to the slow track when the alarm was raised.

It meant the train could stop at a platform in Huntingdon.

Uninjured passengers were interviewed by police and some boarded a coach bound for London.

Huntingdon MP Ben Obese-Jecty told the BBC there were about 10 ambulances, several fire engines and “well over 20 police cars” when he first arrived at the scene just after 21:00.

National Rail said the station would remain closed until the end of the day on Monday.

The empty train was seen at the platform on Sunday along with a police presence and forensics tents.

Emergency crews took 10 people to Addenbrooke’s Hospital in Cambridge – which is some 30 minutes away from the train station – and one person later went to the hospital for treatment.

Shortly before 18:00 on Sunday, police said five people had been discharged from hospital and one remained in a “life-threatening condition”.

“This casualty is a member of LNER rail staff who was on the train at the time and tried to stop the attacker,” the police said.

“Detectives have reviewed the CCTV from the train and it is clear his actions were nothing short of heroic and undoubtedly saved many people’s lives.”

The 10 people whose attempted murder Mr Williams is charged with are:

Scott Bletcher

David Presland

Sachin Balakrishnan

Michael Paffett

Kevin Neely

Jonathan Gjoshe

Stephen Crean

Samir Zitouni

Rasha Aslam

Scott Green

On Monday morning, Transport Secretary Heidi Alexander told BBC Breakfast the staff member was “in hospital in a critical but stable condition”.

She added that “the bravery that he showed was utterly remarkable” after putting himself “in harms way”.

“There are people who are alive today who wouldn’t be… were it not for his actions.”

Alexander also described passengers “hiding in the toilet cubicles” and other carriages as the attack unfolded.

Witnesses told the BBC of panic and confusion as passengers ran through the carriages, some wounded and bloodied.

Alistair Day, 58, told the BBC he hid in the buffet car with about 11 other passengers while the attacker attempted to gain entry.

He said one passenger turned to him and calmly said he had been stabbed in the chest: “He had blood all over him, so we put pressure and stuff and held him.”

Olly Foster said he heard people shouting “run, there’s a guy stabbing literally everyone and everything” and thought at first it might have been a Halloween prank.

He saw an older man with gashes on his head and neck after he “blocked” the attacker from stabbing a younger girl. Passengers used their jackets to try and staunch the bleeding.

Nottingham University student Amira Ostalski was on the train with her friend.

She said when they got off the train as it came to a stop at Huntingdon she thought she would be safe but then she noticed the man – thought to be the attacker – jumping over a fence and running towards them.

“Police came and detained him right in front of my eyes,” she said.

Ms Ostalski added she would feel “vulnerable” if she were to sit on a train again.

Prime Minister Sir Keir Starmer said the “appalling incident on a train near Huntingdon is deeply concerning”.

He wrote on X: “My thoughts are with all those affected, and my thanks go to the emergency services for their response.”

Home Secretary Shabana Mahmood also said her thoughts were with the victims, their friends and family, and praised the emergency workers who responded.

On Monday, the transport secretary emphasised that such incidents were “very rare”, adding that 27 crimes were committed for every one million journeys on the UK rail network.

She added that the government would “review security arrangements” across the network and respond to outcomes “in a practical way”.

Conservative leader Kemi Badenoch told the BBC she was “horrified” by the attack, saying: “I can only imagine how frightening it must have been to be in an enclosed environment with someone rampaging in that fashion.”

Shadow home secretary Chris Philp told BBC Radio 4’s Today programme on Monday that he would like to see mandatory minimum sentences for knife possession “tightened up even further” in response to the attack.

King Charles issued a statement saying he and Queen Camilla extended their “deepest sympathy” to those affected and their loved ones.

LNER urged passengers to check before travelling on Monday due to possible cancellations or changes to services between London Kings Cross and Peterborough.

Tickets for Saturday and Sunday will be valid until Friday, and those who no longer want to travel this week can get a refund.

Huntingdon station will remain closed until the end of Monday, LNER said, adding that a rail replacement bus service was in operation.

Government sources told the PA news agency there will be a “surge” in police presence until at least Tuesday in core transport hubs across the country such as London, Birmingham and Manchester, in addition to Huntingdon.