Security officials inspect the scene of a bomb blast that apparently targeted Egyptian Interior Minister Mohammed Ibrahim near his home in Cairo's Nasr City on Thursday. He survived the attack. Khaled Elfiqi /EPA/LANDOV hide caption

itoggle caption Khaled Elfiqi /EPA/LANDOV

Egyptian soldiers stand guard in front of the constitutional court in Cairo. Al Youm Elsabaa newspaper /EPA/LANDOV hide caption

itoggle caption Al Youm Elsabaa newspaper /EPA/LANDOV

Former Egyptian President Hosni Mubarak sits in the dock during a court hearing in Cairo on June 8. Amr Abdallah Dalsh /Reuters/Landov hide caption

itoggle caption Amr Abdallah Dalsh /Reuters/Landov

In Cairo, soldiers have put barbed wire around the constitutional court, one of many government institutions under guard. Amina Ismail /MCT/Landov hide caption

itoggle caption Amina Ismail /MCT/Landov

A man in Cairo who said he had been wounded by a rubber bullet Friday gets help. Andre Pain /EPA/LANDOV hide caption

itoggle caption Andre Pain /EPA/LANDOV

President Obama, speaking Thursday from the island of Martha's Vineyard, Mass., said the U.S. has canceled joint military exercises with Egypt. Jacquelyn Martin/AP hide caption

itoggle caption Jacquelyn Martin/AP

Posters of ousted Egyptian President Mohammed Morsi lay amid the rubble of a protest camp in Cairo after Wednesday's crackdown by government forces. Ahmed Assadi/EPA/Landov hide caption

itoggle caption Ahmed Assadi/EPA/Landov

Muslim Brotherhood leader Mohammed Badie in Cairo last December. EPA/Landov hide caption

itoggle caption EPA/Landov

A wounded man is helped from the scene Monday in Cairo after shots were fired during a protest against the ouster of President Mohammed Morsi. Mohammed Saber /EPA /LANDOV hide caption

itoggle caption Mohammed Saber /EPA /LANDOV

A poster showing ousted Egyptian President Mohammed Morsi was hanging on barbed wire outside the headquarters of the Republican Guard in Cairo on Saturday. On the other side, guards stood watch. Khaled Elfiqi /EPA/Landov hide caption

itoggle caption Khaled Elfiqi /EPA/Landov

Supporters of the Muslim Brotherhood hold a picture of deposed President Mohammed Morsi during a rally outside Cairo's Rabaa al-Adawiya mosque on Friday. Mahmud Hams /AFP/Getty Images hide caption

itoggle caption Mahmud Hams /AFP/Getty Images

People dance and cheer in Cairo's Tahrir Square on July 4, the day after former Egyptian President Mohammed Morsi was ousted from power. Spencer Platt/Getty Images hide caption

itoggle caption Spencer Platt/Getty Images