"The aim of the terrorists is to split Egypt into two countries, one Christian, and another Muslim".
Egyptian Foreign Minister Sameh Shoukry made the remarks on Saturday during a meeting with his U.S. counterpart, Secretary of State Rex Tillerson.
Egyptian President Abdel Fattah el-Sisi announced on Friday that he had directed strikes against what he called "terrorist camps", declaring in a televised address that states that sponsored terrorism would be punished, Aljazeera reported.
Egypt's foreign minister told his US counterpart, Secretary of State Rex Tillerson, Saturday that the militants who attacked a bus convoy of Coptic Christians a day earlier were trained at a camps inside Libya.
Egypt launched a fresh wave of air strikes against Libyan terrorist bases on Saturday in response to the killing of 29 Coptic Christians south of Cairo, with a warning of further retaliation possible.
He said the attack on a bus carrying Christians, many of them children, would steel the nation's resolve to destroy terrorist organizations and expose "their depraved, twisted and thuggish ideology".
The Christians were headed to the Saint Samuel Monastery, located outside Minya city, about 220 km south of the capital Cairo, when the masked attackers, who came in three pickup trucks, opened fire on them before fleeing the scene.
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The shooting in the province of Minya on Friday, as the Coptic Christians were travelling on a bus to a monastery, was the latest in a series of attacks by IS that have killed more than 100 Copts since December.
There was no immediate claim of responsibility.
Egypt, a non-permanent member in the UN Security Council, said in its letter, "The airstrikes that targeted the locations of terrorist organisations in Derna, eastern Libya, are in line with Article 51 of the UN Charter on self-defence and with the Security Council's resolutions concerning terrorism". Egypt has repeatedly expressed concern over militants crossing from Libya to carry out attacks.
Coptic Christians shout slogans during a funeral service for victims of the bus attack.
Last month two church bombings killed more than 45. also claimed by the so-called Islamic State.
The so-called Islamic State has taken credit for a Friday attack on Egypt's Coptic Christian that left 29 dead, according to the Associated Press.