Two people remain in a life-threatening condition after the attack on a train heading from Doncaster to King’s Cross.
Sky’s Martin Brunt explains why the train didn’t train stop.
Read more of his analysis here: https://news.sky.com/story/police-rehearsed-a-knife-attack-scenario-on-a-train-line-in-march-heres-what-went-differently-this-time-13462585
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