A bystander throws a tear gas canister that came back from the al-Azhar University campus after the canister was originally shot by the Egyptian security forces towards protesters at the school in Cairo, Egypt, Friday, May 2, 2014. Supporters of Egypt's Islamist President Mohammed Morsi continue to protest in the streets as retired Field Marshal Abdel-Fattah el-Sissi, who led last year's overthrow of Morsi, appears poised to win in the presidential election planned this month. (AP Photo/Mohammed Abu Zaid), APTOPIX