Police are investigating whether Anthony Williams, the suspect in a knife attack on a train in Cambridgeshire, is linked to three other recent incidents
Cambridgeshire Police says these incidents include the stabbing of a 14-year-old on Friday and two reports of a man seen with a knife in a barber's shop - where Williams was pictured
The 32-year-old suspect has appeared in court charged with 11 counts of attempted murder, following the train attack and a separate incident in London hours before - here's a closer look at the charges against him
Home Secretary Shabana Mahmood said Williams was "not known to security services", and praises "heroic acts" from passengers and train crew
A man whose hand was "sliced" as he confronted the alleged attacker says he's "going to need plastic surgery" for his injuries
Scunthorpe United footballer Jonathan Gjoshe was among the ten people injured on the train, the club confirms - police say five of those remain in hospital
A 32-year-old from Peterborough has been charged with 10 counts of attempted murder, one count of actual bodily harm and one count of possession of bladed article following a stabbing attack on a train in Cambridgeshire on Saturday, British Transport Police says.
He is named as Anthony Williams.
More on this shortly.
Warning: This post contains distressing details
Eyewitness Matt Kingston was travelling on the LNER train where the attack took place. He was wearing his headphones and was first alerted to the incident when people started running through the train, he tells BBC Breakfast.
As the noise got louder, he says he realised it was "time to go", leaving carriage H and running towards the buffet carriage.
Train staff started closing the shutters to the buffet carriage in an attempt to shelter those inside from the attack. There were around "10 of us jammed in there", Kingston says.
He describes one man leaving the carriage in an attempt to confront the attacker.
Through the window of the carriage, Kingston says he could see the attacker walk past with "quite a large kitchen knife". Then nothing for about 30 seconds, before the attacker came back the other way.
The attacker wasn't saying anything or running rapidly through the train, Kingston says. He describes the environment as "really strange" and "kind of calm in a sense".
Kingston helped a young man who had been stabbed, putting pressure on a wound using "blue roll" from the buffet carriage. "Everyone around" was trying to help, he says.
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Robbie Kalus
Reporting from Huntingdon
Train leaves Huntingdon station
The London North Eastern Railway (LNER) train on which the stabbing attack took place on Saturday evening has just left Huntingdon station, heading north.
The electronic displays read "Edinburgh Waverley" but the destination hasn’t been confirmed by police or LNER.
Former British Transport Police chief constable Andy Trotter says he hopes the incident will prompt a broader review of security on trains.
He tells BBC Breakfast he thinks the incident was handled "very well" by the driver, rail authorities, police and other emergency services.
It is reassuring to know there are more patrols on trains following the incident, but he says that will only work in the "very short-term".
He says many people can feel vulnerable on trains if there is someone causing disorder.
"I think what it illustrates is people's real concerns about being trapped with an offender, with someone causing disorder, and I hope this results in a broader review of security, the need for more BTP, the need for more security from the rail companies themselves," he says.
We can bring you a bit more now from the transport secretary on BBC Breakfast. Police have said the incident is not terror-related, but she's asked if mental health is something detectives are looking into.
Heidi Alexander says she has "no medical information" she can share about the suspect while a live police investigation is ongoing. There are "many questions" that need to be answered, she says.
Alexander says there will be an increased police presence around trains but adds that the public should feel reassured that, despite this attack, the rail network remains a "low crime" environment.
Asked about increased security on trains going forward, Alexander says the government wants to improve security in a "proportionate" way, including by improving CCTV at stations – but says that airport-style scanning technology is not something ministers are looking at.
Heidi Alexander now confirms to BBC Breakfast the rail worker is in a "critical but stable" condition, and remains in hospital.
She pays tribute to his "remarkable" bravery, and says he is a "hero".
"He put himself in harm's way and there are people who are alive today who wouldn't be alive had it not been for his actions," she says.
More on this shortly.
Transport Secretary Heidi Alexander says the train worker - who has been hailed as hero for protecting passengers - is in a "critical but stable" condition.
She tells Times Radio: "There are five people still in hospital, one of whom is the member of train crew... who this morning is in a critical but stable condition."
Alexander is just about to be on BBC Breakfast, so stick with us as we bring you lines from that interview.
Eyewitnesses helped us piece together what happened on the 18:25 service from Doncaster to London on Saturday night:
Robbie Kalus
Reporting from Huntingdon
Good morning from Huntingdon station, where almost 36 hours after the first 999 call went in, only a couple of police cars are left.
Rail replacement buses are snaking up station approach while commuters wait in the rain.
The white-and-red LNER train still sits on platform two, its electronic display boards still showing "London King's Cross" - the destination it never reached.
The station is open to passing trains, with one whizzing past every 10 minutes or so.
‘Heroic’ staff member: One person - a London North Eastern Railway (LNER) worker who police said saved many people's lives while protecting passengers - remains in a life-threatening condition in hospital.
Five discharged: Eleven people were treated in hospital after the attack. On Sunday evening, British Transport Police (BTP) said five had been discharged. None of the injured have been named.
Suspect: A 32-year-old man from Peterborough is being treated as the only suspect. He has not been named but police previously described him as a black British national. He was arrested on suspicion of attempted murder and remains in police custody. Police believe the attack was not terror-related.
Man released: A 35-year-old man, who was also arrested at the scene, has been released with no further action. Police said it had been "reported in good faith" that he was involved, but that was not the case.
Image source, PA MediaWe are restarting our live coverage, as police continue to question a 32-year-old man suspected of carrying out a mass stabbing on a train in Cambridgeshire on Saturday night.
A railway staff member – "who saved many lives" while protecting passengers, according to police – is in a life-threatening condition in hospital.
Eleven people were treated in hospital after the attack. Five have been discharged.
The incident is not being treated as terror-related, but there is expected to be a "surge" in police presence at major railway stations today.
We'll have all the latest news on the injured, and the suspect, on this page. Transport Secretary Heidi Alexander is also speaking to the BBC later this morning.