Egyptian security forces start firing tear gas at biggest Cairo protest - Reuters witnesses

Egyptian police secure the area during a demonstration against President Abdel Fattah al-Sisi and his government's decision to transfer two Red Sea islands to Saudi Arabia, in front of the Press Syndicate in Cairo, Egypt, April 15, 2016. REUTERS/Mohamed Abd El Ghany

CAIRO (Reuters) - Egyptian security forces began firing tear gas at protesters on Friday in an attempt to disperse the biggest demonstration in Cairo triggered by President Abdel Fattah al-Sisi's decision to transfer two islands to Saudi Arabia. In one of the clearest signs that Sisi no longer enjoys unquestioning support, thousands of people called for the fall of the government, chanting a slogan from the 2011 Arab Spring uprising. (Reporting by Eric Knecht and Ahmed Aboulenein; Writing by Michael Georgy)