About 150 dangerous Islamists are being held in prisons across Germany, according to figures from the Federal Criminal Police Office (BKA) published by German daily Die Welt on Wednesday.
The men are either serving jail sentences or are in custody on terror-related charges, the paper cited the BKA as saying.
The newspaper said there were also several “relevant persons” being held, which it said were those regarded as sympathizers or supporters of radical Islam.
“In the next few years we must expect a wave of extremists in our prisons,” the German state of Hesse’s Minister of Justice, Eva Kühne-Hörmann (CDU), told the newspaper.