There is neither a reason nor a legal basis to monitor all mosques and imams as a preventative measure, the head of the Federal Intelligence Service (FIS) has said in a rare interview.

"Mosques, their imams and their supporting organisations are seldom the problem," Markus Seiler told the Aargauer Zeitung, explaining that threats came "mostly from the environment people are in".

However, if the FIS were presented with concrete evidence of a potential threat, it could act preventatively, he said.

In addition, Seiler warned against viewing recent events at the An'Nur mosque in Winterthur, north of Zurich, as a one-off.

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