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Police have released images after two men allegedly robbed a passenger whilst pretending they had a weapon.
The two approached a man in his 20s who was on board a Southeastern service travelling between Greenhithe and Chatham.
They demanded the victim hand over his iPhone and threatened him by imitating they had a weapon.
The incident happened just before 10pm on Saturday, July 14.
Officers believe the men shown in these CCTV images may have information which could help them investigate.
Police said violence of any sort will never be tolerated on the rail network and officers have a number of inquiries underway to identify those responsible for the alleged robbery.
If you know who they are, contact British Transport Police by sending a text to 61016 or call 0800 40 50 40 quoting reference 109 of 25/07/2018.
Alternatively, you can ring Crimestoppers anonymously on 0800 555 111.