British Transport Police have released a CCTV image in connection with a series of sexual offences in Brixton and Golders Green underground.

Several incidents have taken place over the past four weeks:

At 6.30am on Thursday the 31st of August, a man exposed himself and masturbated in front of a woman on a tube service from Brixton, before leaving the service at Stockwell station.

During the same morning, just 20 minutes later, the man re-boarded the service to Brixton and once again exposed himself and masturbated whilst standing next to another woman.

At approximately 6.20am on Tuesday the 5th of September, a woman got on an Underground service at Brixton, a man who was already onboard was masturbating. The woman challenged the man regarding his behaviour, and he stopped.

On Sunday, the 10th of September, a woman entered Golders Green underground station and was followed by a man who stood beside her on the platform and masturbated at her.

Members of the public are being asked to get in touch if they recognise the man in the image, as officers believe he can help with their investigation.

If you recognise the man in the image, please contact British Transport Police using:

• Text – 61016
• Telephone – 0800 40 50 40

Please quote reference number: 457 of 31 August.

Anyone wishing to leave information anonymously can do so by calling Crimestoppers on 0800 555 111.