THUGS who threatened to stab a teenager on a train are being hunted by police.

Officers released CCTV images on Wednesday of men they want to speak to regarding the incident.

Four men approached a 16-year-old student on a train as it came into Hounslow station on August 30 at around 1.35pm.

One of the men sat next to the boy and started nudging him, before threatening to stab him if he didn’t hand over his iPhone.

Detective Constable Mark Agrippa, of British Transport Police’s Robbery Squad, said: “Fearing for his safety, the boy handed over his phone to one of the group. The man who took the iPhone left the service at Hounslow, while the remaining three moved away from the victim and left at Isleworth station.”

So far officers have not had any luck tracking down the men.

They are all thought to be aged between 19 to 20, one with braces on his teeth.

Mr Agrippa added: “This was an aggressive and violent threat on a boy who was alone and we will work tirelessly to identify those responsible. Anyone who recognises the men, please come forward and help.”

Anyone with information is asked to contact British Transport Police on 0800 40 50 40 quoting reference B10/LSA.