Anti-government supporters were involved in clashes with Egypt's army on the third anniversary of the popular uprising of 2011.
Thousands of supporters of Egypt's army chief General Abdel Fattah al-Sissi gathered in Tahrir Square to mark the anniversary.
More top news
Minister will fail to eliminate the gender pay gap in a generation if it continues to "ignore" evidence to help achieve its goal, MPs warn.
Report criticises ministers for lack of long term plan to recruit and retain teachers in important subjects such as physics and maths.
Emergency services rushed to the scene to douse the flames, but there were no immediate reports of casualties.