Couple 'hunt' paedophiles online

Neil and Katie Ivall call themselves paedophile hunters.

They set up fake profiles online posing as teenage girls, then meet and confront the men who groom them.

They introduced the BBC's Angus Crawford to the secret groups which paedophiles use to share images on Facebook.

They say they have reported many of these images to Facebook, but they are often not taken down.

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