Anger on the streets of Cairo Friday.<br/> <br />That's after three explosions in and around the Egyptian capital left at least four people dead and some 50 others wounded, state media reported.<br/> <br />The blasts come on the eve of the third anniversary of the uprising that overthrew Hosni Mubarak.<br/> <br />No one immediately claimed responsibility for the attacks.<br/> <br />But many among the government's supporters blame deposed President Mohamed Mursi and his Muslim Brotherhood movement.<br/> <br />(SOUNDBITE) (Arabic) PROTESTER, YASSER, SAYING:<br/> <br />"The people demand the immediate execution of Mursi and his aides."<br/> <br />(SOUNDBITE) (Arabic) UNKNOWN EGYPTIAN CITIZEN SAYING:<br/> <br />"They should be executed in a public square; execution for the Brotherhood in a public square! We want revolutionary trials."<br/> <br />But it's Islamist militants based in the Sinai that authorities have been struggling to contain.<br/> <br />The militants have stepped up their attacks since the democratically elected Mursi was d
