Police are hunting a man who allegedly sexually assaulted a woman repeatedly on two different buses in west London.
The 24-year-old woman was travelling on a bus in Ealing when a man sat next to her and started stroking her thigh and grabbing her hands, police said.
The woman, who was on her way to work, told the man to go away and moved to a different seat.
He followed, and after the woman again told him to leave her alone again he sexually assaulted her.
When the Route E3 bus stopped outside Acton High School the victim exited, but the suspect followed her.
He put his arms around her before asking for her telephone number.
He continued to follow her and they both boarded the number 70 bus towards Acton Lane, where the suspect again sexually assaulted her on the lower deck.
She then got off the second bus and began to walk along East Acton Lane, where police say the suspect grabbed her and tried to kiss her.
Pushing him away and now shouting, she told him to go away.
The police were called when the victim eventually got to work after the incident, which happened between 10am and 11am on October 25.
A Metropolitan Police spokesman said: “The suspect is described as between 50 and 60 years old, of slim build with a small face and pointed nose.
“He had greying hair and a distinctive scar or birthmark on his left hand.
"He was wearing a grey or dark green army hat, dark jeans and a black zip-up jacket."
No arrests have been made, police said.
A still CCTV image of the suspect has been released and police are asking anyone who recognises him or has any information to contact them.
Call Detective Constable Natalie Baynes on 07500 607652 or via 101. Alternatively call Crimestoppers anonymously on 0800 555 111 or you can tweet @MetCC with any information.