Supporters of ousted president Mohamed Morsi walk by a bricksmade defensive wall as thousands gather in his support in front of Cairo's Rabaa al-Adawiya mosque on July 9, 2013. Egyptian authorities began questioning 650 people on Tuesday over their suspected involvement in violence in which more than 50 people were killed at an army base where Islamists were demanding the reinstatement of the ousted president. [Photo/Xinhua]