Egypt's President Abdel-Fattah El-Sisi promised vengeance in a speech to the nation after a deadly terrorist attack on a mosque in North Sinai killed at least 235 worshippers.

El-Sisi said that the military and police “will avenge our martyrs” and will respond “using brute force against those fragments of terrorists” in the coming period to ensure stability and security.

Gunmen attacked Al-Rawdah mosque in Bir Al-Abed, after Friday prayers. Eyewitness told Ahram Online that improvised explosive devices were detonated and the gunmen then opened fire at worshippers at the mosque, which is affiliated with Sufi groups.

El-Sisi said that Egypt is facing terrorism alone, on behalf of the region and the whole world, and said that events in Sinai are “an attempt to break our will,” and to end Egypt’s efforts “to terminate the terrorist plan that is aiming to destroy what is left of the region.”

“This evil terrorist attack will only make us more determined, solid, and strong to fight against terrorism,” he said.

The president added that current events in Sinai are “a reflection of efforts in fighting terrorism,” telling Egyptians to be sure that the country’s current fight is the “most honourable against the evil powers.”

"We will fight terrorism with unbreakable power and determination," he said, expressing condolences to the families of the victims and wishing speedy recovery to the injured.