Official says there was a "change in the West's positions" over Syria's war.
Assad appears standing in prayer, flanked by Prime Minister Wael Halaqi and Grand Mufti Ahmed Badreddin Hassoun.
100 prisoners pardoned by President Abdel Fattah Al Sisi included women activists Sana Seif and Yara Sallam.
Photographs showed at least two soldiers pointing their guns on a veiled woman
Jailed Al Jazeera journalists Mohamed Fahmy and Baher Mohamed are among 100 prisoners pardoned by the Egyptian president.
The army said the campaign in the Sinai Peninsula had "achieved its goals" in destroying militant hideouts and equipment.