Overview
- Armed officers halted the train at Huntingdon on Saturday evening and arrested a 32-year-old; a second man detained at the station was released without further action.
- Police say they recovered a knife from the scene as British Transport Police lead the investigation.
- Eleven people received hospital treatment, five were later discharged, and a rail employee who intervened remains in a life-threatening condition.
- Counterterrorism officers are assisting the inquiry, but investigators say they have found no indication of a terrorist motive.
- Detectives are examining possible links to other offences, including an alleged stabbing at an east London station on Saturday and reported incidents in Peterborough, one involving a 14-year-old.