In a short, televised speech after meeting with security officials, Sisi said, "We will respond to this act with brute force against these terrorists".
Saudi Arabian Crown Prince Mohammed bin Salman bin Abdulaziz sent a cable of condolences and consolation to Egypt's President Abdel Fattah el-Sisi on the victims of a terrorist attack on a mosque, in Northern Sinai.
The border was scheduled to reopen for three days to allow travel from both sides, the agency said.
People sit next to bodies of worshippers killed in Friday's mosque attack. EPA
Egypt's General Prosecutor released an official statement on Friday evening, confirming that death toll of the Al-Rawaady mosque bombing reached 235 and left 109 others injured.
The coordinated attack targeted the al-Rawdah mosque, which is attended mostly by Sufi Muslims.
The explosion was followed by gunfire from unknown militants who stationed ahead of the mosque's gates.
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At least 230 people were killed when terrorists detonated a bomb and gunned down worshippers in the North Sinai region.
President Donald Trump, in a tweet, called the attack "horrible and cowardly terrorist attack on innocent and defenseless worshipers in Egypt".
There have been a wave of attacks on the country's Coptic Christian minority, but attacks on mosques are rare in Egypt.
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Palestinian President Mahmoud Abbas also strongly denounced the terror attack, voicing his solidarity with Egypt.
No group immediately claimed responsibility, but since 2013 Egyptian security forces have battled a stubborn Islamic State affiliate in the mainly desert region, and militants have killed hundreds of police and soldiers.
The global community must continue to strengthen its efforts to defeat terrorist groups that threaten the United States and our partners and we must collectively discredit the extremist ideology that forms the basis of their existence. "India resolutely supports the fight against all forms of terrorism and stands with the people as well as Government of Egypt".
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Prime Minister of United Kingdom Theresa May called the attacks "sickening" "evil" and "cowardly".