TRANSCRIPT:
That's the sound of emergency vehicles in the U-K, after a stabbing rampage on a British train.
Ten people have been injured - nine of them critically - following the incident in Cambridgeshire, which British Transport Police say took place on a train service travelling between Doncaster to London's King's Cross.
Olly Foster was on board the train when the attack took place, not long after the London North Eastern Railway (LNER) train left Peterborough station.
"I was in Coach H. I was literally just listening to Audible on my phone, and then I had a guy suddenly run past going, ‘run, run. There's a guy stabbing, literally everyone, everything'. At first, there was a few of us kind of looking at each other like thinking was it a joke, like it was Halloween, might be pranking, but then you can kind of see their faces, they’re being serious. So I kind of got my stuff and I was running and everyone was really pushing behind us, really panicking. And at this point I was kind of asking questions like, what's what's going on?"
Another eyewitness, Gavin, has told Sky News he heard others on the train say the suspects had a knife.
"What happened was I was in coach G, and there was quite a few people coming through coach G, and one of the people that were coming through, had my headphones on, then heard them say they've got a knife. I've been stabbed. And then when looking up so they were making their way through the carriage to get away from the incident, from the suspects. They were extremely bloodied. That person ended up when we pulled in, they were basically on the floor."
He says they pulled the emergency contact to let the driver know of their situation.
"We couldn't progress further down the train, away from the suspect, because that person ended up collapsing on the floor. So they were taken into an ambulance pretty much straight away. I think the driver did the right thing when we... pulled the emergency contact to let the driver know that something's going on, he pulled into Huntingdon."
Two men have been taken into custody after armed officers intercepted the train service.
Conservative MP for Huntingdon, Ben Obese-Jecty, has praised the quick arrival of authorities on the scene - approximately 100 kilometres away from London.
"I think the swiftness of the response, the number of police officers who were on the scene when I arrived was simply staggering. Huntington Station is actually very near to Cambridgeshire police headquarters. So you couldn't have asked for a shorter distance, for that response to occur. So, so very reassuring. But at the same time, terrifying that this incident occurred in this area."
Britain's counter terrorism police are investigating the attack.
Ben Obese-Jecty says little is known about the two men who have been arrested in connection to the incident.
"No information on the two individuals thus far. Very difficult to know exactly how both individuals were involved, so you mentioned, that one of them was the perpetrator. I don't know enough about the incident to be able to give you any more information, I'm afraid."
The country's Home Secretary Shabana Mahmood has urged people to avoid speculations about the motive behind the incident.
But the Huntingdon M-P says he's hugely concerned by knife crime.
He says it's an issue he's raised multiple occasions in Parliament.
"It's something that is necessarily we see very much of in this part of Cambridgeshire. So to have it brought to our doorstep is extremely concerning. It's something that I take very seriously and I'll be looking to make sure that I can speak to the police and understand what we can do to make sure that incidents like this don't take place going forwards."
