A thief who stole a chain from a 16-year-old boy in south-east London then checked his reflection in the lens of a CCTV camera, police have said.

Officers said the suspect snatched the chain and a bracelet from the 16-year-old in Bromley, and threatened to stab him when he attempted to retrieve the jewellery.

In a set of images released by the British Transport Police, the thief is later seen using a CCTV camera to check his reflection, while trying the stolen items on himself.

Det Con Dan Arundell said: “They were approached by a black male who demanded the victim show him the bracelet he was wearing.”

“The suspect grabbed the bracelet and then grabbed the chain from his wrist. He then asked if the necklace matched and grabbed that from the victim.”

“The suspect is then captured on CCTV trying on the necklace and checking himself out in the reflection of the camera.”

The images have been released in an effort to track down the thief.

Anyone who can identify the youth in the CCTV is asked to contact British Transport Police on 0800 40 50 40 or the Witness Appeal Line on 0207 391 5275 quoting background log B10 of 10/06/08.