POLICE hope this CCTV image will help trace a pair of violent robbers who left a 13-year-old girl badly beaten.

The victim was sitting on the top deck of the 353 bus in Orpington High Street when she was approached by two older girls, aged about 15 and 16, at 4pm on Wednesday, March 16.

The older girl, described as a light-skinned black girl with black hair tied in a bun, snatched the victim's mobile phone.

A struggle began and the 13-year-old was punched in the face and head and kicked by both girls.

The second suspect is described as white, with shoulder-length hair.

Anyone with information should call Det Con Lena Kennedy at Bromley Police on 020 8284 9966 or Crimestoppers anonymously on 0800 555 111.