United Nations Secretary-General Ban Ki-moon condemned Friday's explosions in and near Cairo as "terrorist attacks" and said no cause could justify such acts. The United States also condemned the violence and urged restraint.
The Islamist Mr. Morsi came to power as Egypt's first democratically elected president after Hosni Mubarak stepped down under pressure nearly three years ago.
Just more than two years later, the military-backed government of secularists and liberals that replaced Mr. Morsi designated the Muslim Brotherhood a terrorist group following a bombing of security offices north of Cairo that killed 15 people.
The al-Qaida-linked group Ansar Beit al-Maqdis claimed responsibility for a September 2013 bombing in Mansoura and other attacks, saying they were carried out to avenge the military-backed government's crackdown on Islamists.