Tracing child abusers: Where was this picture taken?

3 min read Original article ↗

Europol holds more than 40 million images of child sexual abuse but often it doesn't know who the abusers or victims are.

So it's posting parts of these images online - with the people removed - and asking the public to help identify the locations.

A film by Lily Freeston for BBC World Hacks. Find out more on the podcast.