"There can be no tolerance for barbaric groups that claim to act in the name of a faith but attack houses of worship and murder the innocent and defenseless while at prayer", she said.
"The world can not tolerate terrorism, we must defeat them militarily and discredit the extremist ideology that forms the basis of their existence!", he wrote.
There was no immediate claim of responsibility for the attack, but Egypt's security forces are battling an ISIL insurgency in north Sinai.
Al-Sisi said that the Friday's attack aimed to spread a seed of doubt among Egyptians about the capacity of the state, but affirmed that the armed forces and police will be responding to restore security in north Sinai.
The extremists attacked the al-Rawdah mosque in the town of Bir al-Abd, 40 km (25 miles) from the North Sinai provincial capital of el-Arish, opening fire from four off-road vehicles on worshippers inside during the sermon, three police officers said.
Militants have carried out several attacks in Sinai since the 2013 military ouster of the country's Islamist former President Mohamed Morsi, killing hundreds of soldiers, police, and civilians.
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The attack started when an explosive went off in a building adjacent to the mosque, and gunmen fired at worshippers as they fled, eyewitnesses told CNN. Although have already been a prime target of terrorism over the past years, India condemned the mosque attack, saying the "heinous" terror act is a "stark reminder of the need to develop a global strategy to fight terrorism".
Egypt's reaction: The President vowed to restore security and avenge those killed.
Condolences with all those in Egypt affected by this evil and cowardly act.
Egypt's President Abdel Fattah al-Sisi at a press conference in Paris on October 24, 2017.
MENA also said a state of emergency had been declared in Sinai.
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