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Story summary
- British Transport Police seek five men over knife attack on a Tube train in north-west London.
- The incident occurred 23:00 GMT on December 29, when an intervening passenger tried to help an elderly passenger threatened by a gang.
- Intervening passenger was slashed in the face.
- Attackers fled Northwick Park Underground station after stealing the victim's bag.
- Police have released images of suspects and urge anyone with information to come forward.
