The children's charity NSPCC calls the figures 'alarming' and the 'tip of the iceberg'.
There were increases in all four force areas.
Girls were found to be the most at risk, forming 97% of child sexual abuse material shared online, according to the Internet Watch Foundation's most recent UK annual report. Jacqueline Beauchere, global head of platform safety at Snapchat, said: "Any sexual abuse of children is abhorrent and illegal.
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