Detectives are appealing for information and witnesses following a sexual assault onboard a Route 358 bus travelling from Penge towards Crystal Palace.
At around 10:30hrs on Monday, 9 April the victim, a 16-year-old girl, boarded the bus at Croydon Road with her friend.
They sat together on a set of three seats at the back of the single-decker bus.
A man boarded the bus at Anerley station and sat in the seat next to the victim.
He then began making inappropriate comments towards both the victim and her friend.
The two females asked the man to move so they could get out of their seats, but he declined.
As they tried to move past, he sexually assaulted the victim.
The suspect is described as a white male in his 20s, around 5ft 8ins tall with short, brown hair and brown eyes.
He was wearing a dark grey cotton tracksuit and white trainers. He smelled of cigarettes and was holding a green lighter.
If you can identify this man or offer any information to assist the investigation, please contact police on 101 or tweet @MetCC.
Alternatively, you can contact Crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org (Source: Metropolitan Police press release)