ANKARA, Nov. 26 (Xinhua) -- Turkey announced on Sunday that Monday would be a day of national mourning for the deadly terror attack in Egypt's Sinai, which killed more than 300 people.

Flags will fly at half-mast at Turkish representations in the country and abroad, the Prime Ministry declared in a written statement.

At least 305 people were killed and more than 100 others injured when attackers bombed a mosque in the town of Bir al-Abed in North Sinai and opened fire on fleeing worshipers on Friday.

Turkish President Recep Tayyip Erdogan, Prime Minister Binali Yildirim, Deputy Prime Minister Bekir Bozdag as well as other senior officials condemned the terror attack and offered their condolences to the Egyptian people.