A 79-year-old woman was sexually assaulted while she waited for a bus in East Finchley.
The woman was sitting at a bus stop in Fortis Green, opposite Springcroft Avenue, at approximately 10.30am on Saturday March 1 when a man struck up a conversation with her.
The man, who was sitting on a fence opposite the woman, then began to sexually assault her.
As the attack took place the victim's bus, the 102, arrived and she boarded, but the suspect did not follow her.
The suspect is described as black, approximately 30-years-old, and was wearing a thick, dark coloured coat with a logo on the right sleeve and light blue jeans. He also wore a hood or a hat and a scarf.
The bus was travelling towards Muswell Hill, from East Finchley.
Detective Constable Alex Peddie said: "This attack took place in daylight on a very busy road. Were you in the area at the time of the assault or were you travelling on the route 102 as it pulled into the stop on Fortis Green? If you saw anything and can assist this investigation, please contact police."
Anyone with information is asked to contact DC Peddie on 0203 276 3071 or call Crimestoppers, anonymously, on 0800 555 111.
No arrests have been made.