The hunt is on to find a sex attacker who followed his victim as she walked home from a shopping trip in Brent Cross.
The man grabbed the woman from behind before running off when her screams alerted passersby on Hamilton Road.
Detectives investigating the attack have identified a suspected on CCTV captured from a nearby store which shows him following the victim.
He is a white man around 5ft 8inches tall of stocky built, with short brown hair and large eyes, aged in his mid 20s with a lightly tanned complexion.
The suspect was wearing a baseball cap, a gilet, jeans and trainers.
Anyone with information about the attacker which took place in October 3 at 10pm is asked to contact police on 101 quoting image reference 197440 or Crimestoppers anonymously on 0800 555 111.
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