Italians joined in too.
Alaa Abdel Fattah was one of the guiding voices of Egypt's 2011 revolution.
In their own words.
The group has benefited from the chaos of Libya's unravelling, taking control of towns and attracting recruits.
Analysis: Militants from far and wide are declaring allegiance to the group as it seeks to spread jihad across the region.
Baher Mohamed and Mohamed Fahmy have been bailed in their retrial for spreading false news. They will return to court later this month.
Nearly one hundred soccer fans have died in clashes with police over the past three years. But the country's interior ministry denies responsibility.
Many residents of Cairo are staying indoors as a huge wall of sand hits Egypt and Israel to the north.