More fighting between backers and opponents of ousted Egyptian President Mohamed Morsi killed nine people Tuesday, despite pleas for calm by the interim president.
Egyptian officials say the violence broke out near a sit-in by Morsi supporters at Cairo University.
The pro-Morsi Muslim Brotherhood says the anti-Morsi side attacked a peaceful protest, while police accuse the protesters of starting the violence.
Fighting between both sides left at least four people dead on Monday.
Interim President Adly Mansour appeared on state television to tell Egyptians that reconciliation is necessary for the country to move forward.
The army has kept Mr. Morsi under house arrest since he was toppled on July 3. His family says they have had no contact with him since his arrest and are threatening legal action to free him
Human Rights Watch is urging the interim Egyptian government to urgently investigate attacks on Christians and other religious groups since Mr. Morsi's ouster. The group says religious and political leaders should "denounce the dangerous escalation of sectarian attacks."