Internet Watch Foundation Annual and Charity Report 2006 / Internet Watch Foundation, 17 April 2007
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"New figures from the Internet Watch Foundation (IWF) 2006 Annual Report show the severity of online child abuse content is increasing, with a four-fold rise in images depicting the most severe abuse, such as penetrative and sadistic sexual activity. This trend reflects an apparent growing demand for purchasing more severe images with nearly 60 per cent of commercial child abuse websites selling child rape images. 29 per cent of all potentially illegal child abuse URLs known to the IWF contain level four and five images."