Police have released a CCTV image of a man they want to speak to after a passenger was threatened with a knife on a DLR train between Blackwall station and Westferry station.
The incident happened at around 9.20pm on Wednesday 6 December. The man approached the victim, who was sitting on the train, and shouted at him. He then kicked the victim before removing a knife from his waistband and rapidly moving it towards the victim.