Security expert Mahmoud Qatary ruled out that Islamic State (IS) to be behind the threats to editor-in-chief of Al-Bawaba News, Abdel Rehim Ali, affirming that the Muslim Brotherhood (MB) is the real source, Al Bawaba reported Sunday. "The MB aims at terrorizing Ali, in order to stop him from his mission of exposing their plans against Egypt," Qatary told Al-Bawaba, asking Ali to carry on his efforts to reveal the traitors.