Tensions are increasing between Berlin and Ankara over claims that Turkey has been using Islamic preachers in Germany to spy on supporters of Fethullah Gulen, the U.S.-based cleric who President Recep Tayyip Erdogan accuses of orchestrating last July's failed coup against him.

German police raided the homes last week of four imams suspected of collecting information on members of Gulen's religious movement. Authorities say the spying in Germany by clerics paid by the Turkish government is part of a broader espionage effort likely extending to other European countries, including neighboring Austria, with imams hiding behind religion to conduct espionage on behalf of Ankara.

An official with the federal prosecutors' office told VOA further raids couldn't be ruled out.

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