Officers investigating a robbery on board a train have released CCTV pictures.

The incident occurred on August 11 at around 2.45pm when two men demanded their victim hand over his phone as they reached Dartford station.

They grabbed him by the neck after he tried to move away before grappling him to the floor and making him unlock his phone.

Both ran from the station and officers believe the men in the CCTV images may have information which could aid the investigation.

If you recognise them or have any information, contact British Transport Police by texting 61016, or call 0800 405040 quoting reference 322 of August 11.

You can also call Crimestoppers anonymously on 0800 555111.