Paedophiles have become increasingly adept at concealing their identities and communications, with encrypted chats, the dark web and live-streaming among the techniques used.The NCA is among the agencies developing new detection tools to identify and remove material, while tracing those uploading and viewing it.

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* The Labour Party in Calderdale has been plunged into a crisis as their lead candidate, and former Mayor of Hebden Royd, Stewart Brown, has been arrested on suspicion of child porn offences.

Labour Councillor and Deputy Council Leader (Northumberland), John Whiteman, who was also a senior member of the local police authority – Convicted and fined in 2002 for soliciting a prostitute in the red light district of Middlesbrough.

Analysis of his computers, mobile phones and external hard drives also uncovered 78 images showing Page “engaged in sex acts with dogs”, officials said.

He was sentenced to three-and-a-half years in prison at Southwark Crown Court after admitting 22 offences including making and distributing indecent images of children, bestiality and drug possession.

The NCA said child abusers attempting hide behind anonymous usernames online were not beyond the reach of law enforcement and vowed to track them down.

Operations manager Martin Ludlow said: “Jon Page was part of a dangerous community of offenders who produce and share images of child and animal abuse in online chatrooms.

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Convicted MPs – at a glance Labour Councillor (Northampton/Northamptonshire), and former School Governor, Alec Dyer-Atkins – Convicted and jailed for 2 years in 2003 for downloading more than 42,000 pictures and films described in court as “Horrifying images of child abuse”.