Peter Saunders from the National Association for People Abused in Childhood (NAPAC), has called for the government to allocate more funding to police services working to tackle the growing number of children being abused on webcams and live video streaming technology online.
Speaking on Daybreak, he said: "The crime of child abuse is possibly the most hidden crime of our society....We have a lot of work in society to do."
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Mladic, now 75, was the military commander of Bosnian Serb forces in the 1990s, who fought against the Bosnian Croat and Bosniak armies.
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His representatives said Cassidy, who was hospitalised last week, died "surrounded by those he loved."