Police on the platform by the train at Huntingdon station after a mass stabbing on a London-bound train in eastern England, in Cambridgeshire, England. (AP)

British police say one of two men arrested over a stabbing attack on a train has been released without charge. The only remaining suspect is a 32-year-old British man who remains in custody on suspicion of attempted murder.

Police said earlier that two men, aged 32 and 35, were arrested after the attack that left 11 people hospitalised.

One victim remains in a life-threatening condition – a member of train staff whom police say saved lives with his “heroic” actions.

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