The Culture Secretary Maria Miller has said internet companies have agreed a "fundamental change in the approach of the industry to removing child abuse images that are too readily available online."
She told ITV News that the Internet Watch Foundation (IWF) would be "actively seeking out those abhorrent images" rather than waiting for such sites to be reported.
Ms Miller said Cabinet members "all take this very seriously and we are working together across departments."
Technology giants and the Government have agreed a new approach to tackling online child abuse images.
A former Child Exploitation and Online Protection Centre chief is sceptical about what the summit to tackle child abuse images will achieve.
The volume of images of child abuse may have grown slowly, but their numbers now represent a change of a horrifying nature.