A 32-year-old man is now the only suspect after multiple stabbings on a train, police have confirmed.
A member of LNER staff remains in a life-threatening condition following the attacks on a train from Doncaster to London King’s Cross, which stopped in Huntingdon, Cambridgeshire shortly before 20:00 GMT on Saturday.
A 35-year-old man, arrested at the scene, has been released with no further action after it was reported “in good faith” that he had been involved in the attack.
British Transport Police (BTP) said the suspect, who is from Peterborough, boarded the train at the city’ station. They also confirmed five casualties have now been discharged from hospital.
A BTP statement confirmed the LNER staff member had tried to stop the attacker, and said it is “clear his actions were nothing short of heroic and undoubtedly saved many people’s lives”.
Dep Chf Con Stuart Cundy said: “Our investigation is moving at pace and we are confident we are not looking for anyone else in connection to the incident.”
The force said a knife had been recovered by officers at the scene.