Peter Davies, head of the Child Exploitation and Online Protection Centre (CEOP), said there was now a "class of child abusers very proficient in technology" who are consistently trying to evade authorities by finding new means of accessing children.
Speaking to Daybreak, he said: "The old model, with a view of meeting online with a view to meeting offline and then physical abuse taking place is actually a diminishing, these days sexual abuse of children can take place purely online."
More top news
A selection of UK newspaper front pages after Scotland voted to stay in the United Kingdom.
Gamers have been given a taste of what Final Fantasy XV will look like after developer Square Enix released a new trailer.
ITV Central Correspondent Gareth Owen looks at how the decision for Scotland to remain part of the UK will affect the Midlands.