Two women have reported a man who pretended to be asleep on underground trains but instead exposed himself in front of them.

British Transport Police (BTP) officers have released images of a man they wish to speak to relating to two incidents on the Northern Line.

On December 23 at about 9.40pm a woman boarded the northbound train at Tufnell Park and sat opposite a man who looked to be asleep. 

When the woman looked across, the man was not asleep and was masturbating, a BTP spokesperson said.  

The woman quickly moved to another carriage. 

It is believed the man left the train at East Finchley.

Ham & High: Police wish to speak to this man after two women reported seeing a person asleep on the Northern Line who then masturbated in front of themPolice wish to speak to this man after two women reported seeing a person asleep on the Northern Line who then masturbated in front of them (Image: BTP)

Later that evening, at about 10pm, a second woman boarded the northbound Northern Line at Leicester Square and took a seat. 

"At Camden, the same man from earlier that evening boarded the train and sat opposite her," the BTP spokesperson said.  

"It looked as if the man was once again asleep but when the woman looked over, the man had indecently exposed himself. 

"On this occasion, the woman verbally confronted the man and he then left the train at West Finchley."

Officers believe the man in the CCTV image may have information which could help their investigation.

If you recognise him, or have any information, contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 2200133485.

Alternatively call Crimestoppers anonymously on 0800 555 111.