In front of his mother, a 10-year-old child was sexually molested in central London.
At Leicester Square station, the child was climbing the stairs with his mother when a stranger molested him and then fled.
His frightened mother tried to catch the culprit after chasing him through the busy station, but she was unable, according to the police.
British Transport Police have now made a CCTV image of a man they want to speak to in relation to the incident, which took place on February 16 at about 4.30 p.m.
A statement from the force said: ‘Do you recognise this man?
‘Officers investigating a sexual assault at Leicester Square Underground station are releasing this image in connection.
‘At around 4.30pm on Thursday, February 16, a 10-year-old boy was walking up a set of stairs at the station with his family when a man sexually assaulted him and ran away.
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‘The victim’s mum chased the man through the station, but did not catch him.
‘Officers believe the man in the CCTV image may have information which could help their investigation.
‘If you recognise him, or have any information, please contact BTP.’