Amsterdam's late mayor Eberhard van der Laan was involved in a secret anti-radicalisation plan involving a city official recently sacked over corruption claims, according to Elsevier magazine.

The magazine claims Van der Laan and two civil servants, Saadia A T and Mounir Dadi, were working on a 'grey campaign' to spread a strong 'counter message' to youngsters who were becoming radicalised.

The secrecy was such that the project was not refered to in emails or in diaries and documents had to be stored on the private computer drives of people in the know, Elsevier said.

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