Detectives are looking to speak to a man in connection with a sexual assault on a bus in Wembley.
The disturbing incident unfolded after a teenage girl boarded the upper deck of the 18 bus towards Euston at 8.15pm on Tuesday, August 23.
A man later boarded in Wembley and sat next to the victim, even though there were several free seats.
He then proceeded to touch her chest with his elbow and stroke her leg. The woman told him to stop several times but he refused.
He eventually stopped when the woman raised her voice and other passengers started to pay attention.
The woman then got up and left the bus in Stonebridge Park.
The man is described as Asian, approximately 20 to 30-years-old, with short black hair and a beard. He was wearing bright coral shorts, a green T-shirt and black and blue trainers.