More than 800 suspected criminals have been arrested worldwide after being tricked into using an FBI-run encrypted messaging app.
The sting has led to the arrest of suspects from organised crime groups in 18 countries, including Australia, Asia and South America.
The operation was coordinated by Europol - the EU's police agency - who described it as the "biggest ever law enforcement operation against encrypted communication."
Lucy Hough has more.
IN: The targets
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