Police are appealing for information following a series of sexual assaults near a north-west London Underground station.
The attacks took place over three consecutive weekends near Dollis Hill station, Scotland Yard said, and officers are treating the attacks as connected.
A 30-year-old woman was followed by a man around 11.25pm on August 28 and was sexually assaulted in Fleetwood Road, Brent.
Eight days later, on September 5, a 21-year-old woman was sexually assaulted near Ellesmere Road just after noon. 22:00, before a member of the public intervened and the suspect ran away.
So at 10.15pm on 9/11, another 21-year-old was sexually assaulted in Ellesmere Road, where the suspect fled after a member of the public stepped in.
Each victim described the man as mixed race, slender, with stumps on his face and wearing black clothes.
The officer in charge of the investigation, Detective Inspector Jonny Newell, noted that the attacks took place “on a weekend, at a similar time and in close proximity to both the subway and each other”.
“Clearly, the perpetrator is waiting at or near the subway station for the sole purpose of seeking out women to accompany him to a secluded area before carrying out his attacks,” Newell said.
“On each occasion, the victims have managed to sound the alarm, which caused their attacker to flee the scene. We are incredibly grateful to the two members of the public who came to their aid.
“Understandably, all the women have been shaken, and we are doing everything we can to stop it again.
“We would encourage everyone living in the area to think about whether they saw anything suspicious on any of these evenings and to check any CCTV or doorbell recordings they may have.
“Sexual assaults of this kind are still very rare, but we will of course carry out extra patrols in the area over the next few weeks.
“Dealing with violence against women and girls is one of the Met’s top priorities, and we are determined to stop this man from causing further harm.”
Anyone with information please call 101 with reference to 8659 / 11SEP. Information can also be given anonymously to Crimestoppers by calling 0800 555111.