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.
