A woman had been traveling in the back of the 410 bus toward Crystal Palace, near Dinsdale Gardens, at 11:45 a.m. Sunday, Oct. 24, when the man bared and touched himself inappropriately.
The victim challenged him, and the man immediately got off the bus at Dinsdale Gardens and ran off.
Officers from the Road and Transport Policy Command have released a picture of a man they are working to track down.
Anyone who recognizes him should call 101 ref. CAD 3155/24. Oct Alternatively tweet @MetCC, or to remain 100% anonymous contact Crimestoppers on 0800 555 111.