This file photo shows a view outside the National Crime Agency building in London, England in October 2013.
- A crime group charged people money to watch child sexual abuse online
- Police say 29 people have been arrested in an investigation running since 2012
- The operation resulted in 15 children in the Philippines being rescued, authorities say
- Some of the people facilitating the abuse were from the children's families, police say
(CNN) -- Investigators have busted an international pedophile ring that charged people money to watch live online broadcasts of Filipino children being sexually abused, authorities said.