Germany on Monday expelled four Syrian diplomats stationed at Damascus's embassy in Berlin, AFP reported, in an effort to further isolate the regime of Bashar Assad."We are sending a clear message with the expulsion of four Syrian embassy staff that we are reducing relations with the Assad regime to an absolute minimum," Germany's Foreign Minister Guido Westerwelle said in a statement.According to AFP, the German Foreign Ministry gave the designated staff until Thursday "to leave their posts."Berlin in May expelled Syria's ambassador to Germany following a massacre of more than 100 people in the Houla region, north of Homs.