The Daily Telegraph understands that the raids followed a discussion of the risk posed by a pan-European network of Salafist Islamists at an EU meeting of interior ministers, including Theresa May, the Home Secretary, last week.
Last month, the G6 group of interior ministers from the EU's biggest countries met in Munich to discuss "suspicious patterns of movement".
Secret intelligence gathered by police and anti-terrorism officers across Europe gave "cause for concern" in Germany, Britain, France, the Netherlands and Austria, said an official.
According to leaked documents, the German interior ministry decided to launch the raids and to ban Millatu Ibrahim, based in the western town of Solingen, after an explosive vest was found during a search of premises in Berlin last month.
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