Al-Sisi's decision came hours after deadly blasts at two churches in northern Egypt left at least 43 dead and over 100 injured.
"This treacherous terrorism targets the nation with its citizens, both Copts and Muslims, and it will never break the determination of the Egyptians and their true will to confront the powers of evil," Xinhua quoted the Egyptian president as saying.
The president also announced a three-day mourning for the victims.
Later on Sunday, the Islamic State (IS) group claimed responsibility for the twin church bombings in the northern provinces of Gharbiya and Alexandria on its Amaq news website.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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