POLICE are investigating after a woman had a necklace pulled from around her neck when she answered her front door.
The robbery took place on April 30 at Pembroke Road in Wembley at around 8pm.
A 67-year-old woman answered her door to the suspect who suddenly grabbed the victims chain from around her neck and ran off down Llanover Road.
The suspect is described as black and around 5 ft 6 in. He is thought to be in his teens and was wearing a blue top.
PC John Muir, from the Priority Crime Unit, said: I believe that there would have been many people in the area at the time who may have heard or seen the events leading up to this snatch.
"I urge anyone with information to contact us on 0208 733 3100. If you wish to remain anonymous you can call Crimestoppers on 0800 555 111."
Police have issued crime prevention advice following the incident.
They are advising residents to use their door viewer, or look through their front window to see who is there before answering.
Police are suggesting that people also put the chain on before they open the door.