Ten people are in hospital – nine believed to have life-threatening injuries – after a stabbing attack on board a Doncaster-London King’s Cross train on Saturday

Two people have been arrested after the train made an unscheduled stop at Huntingdon station, where dozens of officers rushed to help

British Transport Police say counter-terrorism officers are supporting the investigation as they “work to establish the full circumstances and motivation”

An eyewitness tells the BBC they saw a man with a bloodied arm fleeing down a carriage yelling “they’ve got a knife” – another witness says police Tasered a man on a platform

Prime Minister Keir Starmer says the “appalling incident” is “deeply concerning” and urges people to follow the advice of local authorities

Train was travelling from Doncaster to London’s Kings Cross – and stopped in Cambridgeshire

A lot of places have been named in the reporting of this attack – let’s break that down.

When news initially broke of the stabbing attack, late on Saturday, police said it had taken place in Huntingdon, Cambridgeshire.

We later learnt that the train itself was the 18:25 GMT service from Doncaster, in South Yorkshire, to London King’s Cross.

Some passengers have said the attack started to unfold shortly after the train left Peterborough, also in Cambridgeshire – a scheduled stop, which is about an hour from London on the train.

After police received reports of the stabbings, the train made an unscheduled stop at Huntingdon station – around 15 minutes from Peterborough by train. This is where armed officers from Cambridgeshire Police were able to board the train, make their arrests and help passengers.

Images from the scene show unharmed passengers being put on buses bound for London a little before 23:00.

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Here’s What We Know:

It’s almost 07:00 here in the UK – and for those just waking up to this news, or looking for an update, here’s what you need to know.

Ten people are in hospital – nine with life-threatening injuries – after a stabbing spree on the 18:25 train service from Doncaster to London King’s Cross on Saturday
Police received calls from passengers on board the service at about 19:40, alerting them to the incident
The train then made an unscheduled stop at Huntingdon, Cambridgeshire, where armed officers and emergency services rushed to the platform
At about 21:45, the mayor of Cambridgeshire announced that two people had been arrested and were in custody – Cambridgeshire Police later confirmed this
Counter-terror police have since joined the investigation, while officers work to understand what happened – and why
And here’s what we still don’t know:

1. The identities of the 10 people injured

2. Details of the two people who were arrested.

3. The motive for the attack