A terrified couple were robbed at gunpoint on a double-decker bus last week.

At approximately 1.30am last Wednesday two youths boarded a route 250 bus in Green Lane, Norbury, and approached the couple, who were sitting on the top deck.

One of the youths produced a handgun and demanded the frightened couple hand over their valuables.

When the victims said they had nothing to give, the teenagers took a baseball cap off the man's head.

They then got off the bus and ran through a BP petrol station towards London Road.

The youth who was carrying the firearm is described as a 17-year-old black male, wearing black jeans, a white hooded top and a green jacket.

His accomplice is also described as a 17-year-old black male, wearing a black track-suit with a blue scarf over his face.

If you were on the bus, in the petrol station or have any information call 020 8649 1217 or Crimestoppers anonymously on 0800 555 111.