Four members of the Gaza-based militant group Hamas alongside other militants have been detained on suspicion of planning attacks on Jewish institutions in Europe, according to German prosecutors and other authorities on Thursday. Three suspects were detained in Berlin, three in Denmark and another was detained in the Netherlands, BBC reported.Four members of the Gaza-based militant group Hamas alongside other militants have been detained on suspicion of planning attacks on Jewish institutions in Europe, according to German prosecutors and other authorities on Thursday. Three suspects were detained in Berlin, three in Denmark and another was detained in the Netherlands, BBC reported.