Following the attack on the mosque in Egypt's Northern Sinai province on Friday which killed 235 and injured over 130, world leaders took to micro-blogging site Twitter to express their condolences and condemn the act of terror.
President Abdel Fattah El Sisi convened an emergency security meeting soon after the attack, state television reported.
The presidency has declared three days of national mourning.
The target: The mosque is known for being the birthplace of Sheikh Eid al-Jariri, a Sufi cleric considered the founder of Sufism in the Sinai Peninsula.
The gunmen then mowed down panicked worshippers as they attempted to flee and used the congregants' vehicles they had set alight to block routes to the mosque. The attackers also opened fire on ambulances, witnesses said.
Dozens of bloodied bodies wrapped up in sheets were laid across the mosque floor, according to images circulating on social media.More news: Flynn's lawyers no longer sharing information with Trump's legal team
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White House Press Secretary Sarah Sanders, in a statement following the attack in Egypt, called on the worldwide community to strengthen its efforts to defeat terrorist groups.
Egypt has suffered one of its deadliest terrorist attacks in its modern history.
The terror attack has drawn widespread local and worldwide condemnation as cowardly act of terrorism.
He added in his tweet "The world can not tolerate terrorism, we must defeat them militarily and discredit the extremist ideology that forms the basis of their existence".
Friday's bomb and gun assault on the Rawda mosque near North Sinai provincial capital of El-Arish killed at least 235 people.
No group has claimed immediate responsibility, but since 2014, Egyptian security forces have battled a stubborn Islamic State in Iraq and Syria (ISIS) affiliate in the north Sinai, which is mainly desert, where militants have killed hundreds of police and soldiers.
Saudi Crown Prince Mohamed Bin Salman strongly denounced the killing of the worshippers as "a coward terrorist action that killed honest secured people in one of God's houses".