The 32-year-old man, a German who was believed to have converted to Islam and become radicalised, was arrested yesterday evening in Essen. Hs name wasn't released in line with German privacy rules.
Police said that there was "no evidence of a concrete danger of an attack." They gave no details on a possible target.
They said today that he was already known to authorities for petty crime and because of his suspected radicalisation.
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