A teenager was forced to hand over his phone after being threatened with a knife during a robbery on Sunday.

Detectives are investigating the incident in which a 17-year-old boy was robbed just after 6.30pm in Grand Drive, Raynes Park.

The three suspects, who were all in a car, told the victim that they had a knife.

A second 17-year-old boy was also threatened, but he was able to get away. Nobody was injured during the robbery.

Police have said that there have been no arrests and enquiries are ongoing.