Detectives in Brent, who are investigating a linked series of sexual assaults in the Cricklewood area, have been informed of a further offence.
At approximately 03:20hrs on Sunday, 7 October, the victim - who had a caught a train to Willesden Green Underground Station - was approached by the suspect on Walm Lane. He attempted to engage her in conversation before sexually assaulting her.
Officers believe that the offence is linked with nine separate incidents between February and September 2018 where lone women have been approached and sexually assaulted by a man. These have occurred predominately over the weekend in the late to early hours of the morning.
On most occasions the suspect has approached the women as they are walking in the street from Willesden Green tube station and attempted to engage them in conversation, asking for a kiss or hug, before touching them. The suspect is described as a black man, of medium build who is aged in his 20-30s and wearing dark clothing.
Detective Constable Laura Avery, of Brent CID, said: "This a series of shocking sexual assaults on lone women and I am appealing for anyone who has information that could help identify and apprehend this suspect to contact police immediately.
"I would also appeal to women in the local area to take care when they are walking, especially if they are alone. Always stick to well lit streets; if possible, let someone know when you are coming home and the route you are taking and always be alert in your surroundings so don't use earphones or handheld devices.
"If you see anything suspicious, contact police immediately."
Anyone with information is asked to contact Brent CID on 07747476161. Alternatively, call Crimestoppers anonymously on 0800 555 111.
A 37-year-old man was arrested on 19 July on suspicion of sexual assault - he has been released under investigation.