A 32-year-old man is the sole suspect accused of a mass stabbing on a train in England, after another man arrested in the case was released with no charges.

UK police said they do not believe the knife attack that put 11 people in hospital was a terrorist incident.

A 35-year-old man who had been arrested earlier was released after officers concluded he was not involved in the attack.

By late on Sunday, five of the injured had been discharged from hospital.

Among those still being treated was a member of the train crew who tried to stop the attacker and was in a life-threatening condition, police said .

"Detectives have reviewed the CCTV from the train and it is clear his actions were nothing short of heroic and undoubtedly saved many people's lives," police said.

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