POLICE have released an image of a man alleged to have performed a sex act on himself while teenage girls were watching on a phone app.

A 14-year-old Bradford girl was using the app, which allows people to make group video calls, to talk to her friends when a friend request from a user called Hello Hello popped up on the screen. She accepted the request, and a new link opened up, featuring a live feed of a man performing a sex act on himself.

The act was seen by the girl and her friends, who immediately ended the conversation, and she used her phone to capture a screen shot of the man.

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She informed police of the incident, and provided them with the man's image, on May 28.

West Yorkshire Police have now released the image in a bid to track the man down, and say there is no way of knowing where he is from.

Anyone who recognises the man can call police on 101 or Crimestoppers anonymously on 0800 555111.