British police say a 32-year-old man is the only suspect over a mass stabbing attack on a London-bound train that left at least 11 people in hospital.

Authorities in the United Kingdom said on Sunday local time that a 35-year-old man who had also been arrested in relation to the incident was released without charge.

Police are questioning the 32-year-old on suspicion of attempted murder.

They are not treating the stabbings as an act of terror, but have not disclosed a possible motive or the type of knife, or knives, used.

Six people remained in hospitals on Sunday, with at least one person still in a critical condition.

Police said that person was a member of railway staff who tried to stop the attack and saved many lives with his "heroic" actions.

Five other injured people were disc

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