At least 270 people were killed and 109 others injured in a gory terror attack on a mosque in Egypt's northern Sinai region on Friday making it one of the deadliest attacks on civilians in the country.
Police officers told the Associated Press that men in four off-road vehicles shot at worshipers who were at the al-Rawdah mosque for Friday prayers.
Friday's attack has been declared as an unprecedented attack and President Abdul Fattah al-Sisi said those responsible for it will be responded with "brute force".
"Horrible and cowardly terrorist attack on innocent and defenseless worshipers in Egypt", Trump wrote on Twitter.
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.
Eyewitnesses told the privately-run Al-Yawm al-Sabi website that attackers had stormed the Al-Rawda mosque in the town of Bir al-Abd, and then detonated an explosive device, according to BBC Monitoring.
Dozens of bloodied bodies wrapped up in sheets were laid across the mosque floor, according to images circulating on social media.More news: Aston Martin Valkyrie AMR Pro: 25 planned, all sold
Prime Minister Narendra Modi: "Strongly condemn the barbaric terrorist attack on a place of worship in Egypt".
During Palm Sunday of April 2017 ISIL-SP carried out two suicide attacks against the Christian minority of Egypt. St. George's Church in Tanta and Saint Mark's Coptic Orthodox Cathedral in Alexandria were attacked, leaving 45 people dead and 126 people injured.
In March 19 2016 13 Egyptians policemen were killed by ISIL-SP during an attack in the El-Arish checkpoint, Arish is the largest city in Sinai.
Leaders around the world condemned the mosque attack.
The White House also said in a statement that "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".
Sissi called the attack "criminal", and "cowardly".