Two explosions have hit Cairo, as an on-edge Egypt braces for mass demonstrations on the third anniversary of the Arab Spring uprising that toppled Hosni Mubarak. <br /><br />The tensions come a day after four bombs killed six people and injured more than 80 in attacks targeting security forces in the capital.<br /><br />Mubarak was forced to step down on February 11, 2011 after 18 days of demonstrations in which an estimated 850 people were killed.<br /><br />Al Jazeera speaks with Abdullah Al Arian of Georgetown University in Doha.
