A link between terrorism plots and hardcore child pornography is becoming clear after a string of police raids in Britain and across the Continent, an investigation by The Times has discovered. Images of child abuse have been found during Scotland Yard antiterrorism swoops and in big inquiries in Italy and Spain.

Secret coded messages are being embedded into child pornographic images, and paedophile websites are being exploited as a secure way of passing information between terrorists.

British security services are also aware of the trend and believe that it requires further investigation to improve understanding of terrorists’ methods and mindsets. Concerns within the Metropolitan Police led to a plan to run a pilot research project exploring the nature of the link. One source familiar with the proposal said that this could eventually lead to the training of child welfare experts to identify signs of terrorist involvement as they monitor pornographic sites.

Concerns have already been expressed at Cabinet minister level about the risk of vulnerable Muslim youths being exploited by older men.