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Pictures can be distributed to thousands of people in seconds and can never be fully deleted,” said John Cameron, the head of the NSPCC helpline.
Then in July he received a message saying that unless he paid up, explicit material from the conversations would be posted to his family.
Five of those operations – against groups and individuals – were in the UK.
Ceop said the number of victims identified represented a small fraction of the number targeted.
One abuser collected images of his blackmailed victims in a folder named “slaves”.
A British teenager is one of seven young people who have killed themselves over blackmail.