Catching the men selling subway groping videos

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In East Asia, many women like Takako (not her real name) are targeted in public by sexual predators. In some cases, they face another violation - the attack is filmed and the videos are sold online. Most videos follow the same pattern - a man secretly films a woman from behind and follows her on to a train. Seconds later, he sexually abuses her. The men act discreetly - and their victims can seem totally unaware. These graphic videos are then listed on the websites for sale. Thousands of arrests are made every year but many more go undetected and unpunished. For 5 Minutes On, the BBC's Zhaoyin Feng - from the BBC World Service's investigative unit, BBC Eye, tracks down the men behind three websites which sell and produce thousands of these sexual assault videos. Image Credit: BBC News