Detectives have released an e-fit of a man they want to identify as they investigate a case of indecent exposure in Harrow.
The suspect performed a sex act in front of a woman in Pinner View before escaping on a bicycle.
The victim was "extremely distressed" following the incident which happened at 5pm on 3 December. She is being supported by specialist officers.
DC Oneda Mehmeti, from the Met’s North West Command, said: “Offences like this are extremely serious and can have a significant and lasting impact on victims.
“A number of enquiries have been carried out including forensics and speaking with witnesses. We are now hoping that the public can help us identify this man who we would like to speak to.
“I am grateful that the victim in this case came forward. Reporting crimes of this type is vital in order for us to identify and apprehend offenders.”
Anyone with information concerning the identity of the man pictured should call 101 or Tweet @MetCC quoting reference CAD 4664/03DEC23.
To remain anonymous call Crimestoppers on 080 555 111 or visit crimestoppers-uk.org.