A woman was sexually assaulted and robbed as she walked alone in a "horrible ordeal".
The incident happened on Sunday, August 11, at around 3.30pm in Hillfield Avenue, Wembley.
The woman sustained minor injuries and did not require medical treatment, Scotland Yard said.
The Metropolitan Police have released an image of a man they wish to speak to.
Detective Chief Inspector Jinesh Solankee, from the Met's North West area unit, said: “This was a horrible ordeal for the victim and we are committed to identifying this man as a matter of urgency.
“Women should feel safe to walk alone, and we are dedicated to protecting women and girls and eradicating violence against them.
“If you recognise the man in the photo then please contact us without delay.”
Anyone who recognises the man, or has information, should contact police on 101 quoting CAD 1620/12AUG.
Alternatively, contact Crimestoppers anonymously on 0800 555 111 or visit crimestoppers-uk.org.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here