An analyst who removes child sexual abuse content from the internet says she is always trying to stay "one step ahead" of the "bad guys".
Mabel, who uses a pseudonym to protect her identity, works for the Internet Watch Foundation (IWF), a charity based in Histon, Cambridgeshire.
The IWF has a team of frontline staff who identify and remove online child sexual abuse imagery from across the world.
It has identified more than half a million victims this year, but says advances in technology are making the charity's work even more challenging.
Read the full article at BBC News.