British police say one of two men arrested over a stabbing attack on a London-bound train has been released without charge.

The remaining suspect is a 32-year-old British man. He is in custody on suspicion of attempted murder, after almost a dozen people were injured on Saturday night local time.

Police are not treating the stabbings as an act of terror.

• Guest: Graham Wettone, UK policing commentator and a former officer with London's Metropolitan police
• Producer: Anne Barker