Bavaria's interior minister criticized Chancellor Angela Merkel's refugee policies after police raided refugee homes on Tuesday and arrested three suspects linked to Isis.
German President Joachim Gauck on Friday expressed his concerns over security at Euro 2016, saying despite the massive security measures in place "there are people who want to hurt others".
German security services have been put on high alert after picking up terror warnings for public viewings of Saturday night's all-German Champions League final.