Two schoolgirls aged 11 were allegedly sexually assaulted on a Tube train by a man who later tried to grab at one of them on a platform.
Detectives said the pair had been travelling on the Central line from Bethnal Green station when the incident happened.
As they left the carriage at Holborn, a suspect attempted to hold one of the girls and pull her towards him.
Fortunately, she managed to escape between 3pm and 3.30pm on July 16.
The man left the train and boarded a Piccadilly line service.
British Transport Police officers released a CCTV image of a man - wearing a white ‘I Love London’ heart emoji T-shirt, dark cap, shorts and black Nike trainers - seen in the area sitting on a platform. He is also carrying a grey rucksack.
They believe may have information to assist their investigation.
A spokesman said: “Detectives investigating a sexual assault on two schoolchildren have today released this image in connection.
“Sometime between 3pm and 3.30pm on Tuesday, July 16, two 11-year-old girls travelling on a Central Line train between Bethnal Green and Holborn stations were sexually assaulted by a man.
“As they left the train at Holborn the man then attempted to grab one of the girls and pull her towards him but she managed to get away.
“The man left the train at Holborn and boarded a Piccadilly Line train.
“Officers believe the man in the image has information that could assist their enquiries.”
Anyone who recognises him or has any information is asked to contact BTP by texting 61016 or by calling 0800 40 50 40, quoting reference 491 of 16 July.