Police launched dawn raids across Germany on Tuesday on about 190 mosques, flats and offices linked to an Islamist group after the government banned the organization, accusing it of radicalizing youngsters.
Interior Minister Thomas de Maiziere said the DWR "True Religion" group had persuaded about 140 people to join militants in Iraq and Syria.
DWR, also known as "READ!" made no reference to the raids on its website and did not immediately respond to a request for comment. De Maiziere said it had several hundred members.
Pictures showed masked police officers carrying away computers and files from properties.