PLO member Ahmad Majdalani on Thursday accused al-Qaeda and other Islamist organizations were behind the attacks on Palestinian refugees' camps in Syria."The different factions of the [Syria] opposition, including al-Nusra Front and ISIS (the Islamic State of Iraq and Syria), have been invading the Palestinian camps in Syria since the end of 2012," he told a news conference today.   Halso called upon Hamas Movement to wash its hands clean of these groups.