Egypt bombards IS targets after 21 Egyptians beheaded in video Updated on : 16-02-2015 08:29 PM The Islamic State released a grisly video showing the beheading of 21 Egyptian Coptic Christians in Libya, drawing swift retaliation from Egypt which launched air strikes in the neighbouring country, in an escalation of Egypt's battle against growing militancy. For the first time, Egypt publicly acknowledged taking military action in Libya as warplans targetted training camps and arms depots of the dreaded outfit. The attack came as "retribution" to a gruesome five- minute video released by the IS hours earlier that showed handcuffed hostages dressed in orange jumpsuits being murdered by black-clad masked terrorists at a beach near Libyan capital Tripoli. "The sea you've hidden Sheikh Osama bin Laden's body in, we swear to Allah we will mix it with your blood," one of the militants says towards the end of the clip. The beheadings, the first of its kind by the radical group outside the territory it controls in Syria and Iraq, drew immediate condemnation in Egypt, where President Abdel Fattah el-Sisi said on national television that his country "reserves the right to respond in the way and timing it sees fit for retribution from these killers." He warned that Egypt would choose the "necessary means and timing to avenge the criminal killings". Terming the beheading of the Christians as 'vicious', Sisi said a new series of terrorism is spreading across the world and demanded that all people come together to fight it. "Your armed forces on Monday carried out focussed air strikes in Libya against Daesh (IS) camps, places of gathering and training, and weapons depots," the military said in a statement to Egyptians, shocked after the beheading. "Avenging the Egyptian blood from killers and criminals is Egypt's enforceable right. This to let everyone know that Egypt has a shield that protects and safeguards its security and a sword that can cut off terrorism," army spokesperson Mohamed Samir said in the statement. Civilians, including three children and two women, were killed in the strikes, reports said, citing two Libyan security officials who were not named. Nearly 50 militants were killed in the strikes that were were coordinated with the Libyan forces, Libya's air force commander Saqr al-Joroushi told Egyptian state TV. Egypt is battling a burgeoning Islamist insurgency centred in the Sinai Peninsula, where militants recently declared their allegiance to the IS. They rely heavily on arms smuggled across the porous border between Libya and Egypt. Meanwhile, Sunni Islam's top body, Al-Azhar has condemned the "barbaric" beheading of the Christian labourers. "Al-Azhar received the news of the execution of a group of innocent Egyptians with great sorrow and grief," Al-Azhar said in a statement Sunday. As many as 21 such Egyptians were kidnapped from the coastal city of Sirte in December and January. However, it was not clear from the video whether all 21 hostages were killed. The killings raise the possibility that the Islamic militant group has established a direct affiliate close to the southern Italy. One of the militants in the video makes direct reference to that possibility, saying the group now plans to "conquer Rome". During his speech, Sisi offered his condolences to the families of the dead even as he ordered the government to ban Egyptians from travelling to Libya and facilitate the return of others from there. Sisi called an urgent meeting of Egypt's top national security body to decide the course of action. He also asked the Foreign Minister to travel to New York and participate in the "fighting terrorism" summit. "What is happening in Libya is a threat to international peace and security. "These cowardly actions will not undermine our determination," Sisi said. Al-Joroushi said: "More air strikes will be carried out today and tomorrow in coordination with Egypt." Meanwhile, the UN Security Council in a statement also "strongly condemned the heinous and cowardly apparent murder" of the Christians. Earlier in the day, Egypt announced a seven-day mourning period over the beheading. Egypt's Copts are the largest Christian community in the Middle East and are estimated to account for around 10 percent of the Egyptian population. Thousands of Egyptians have headed to Libya to work since the Egyptian uprising in 2011, despite their government's advice that they should stay away from the country. The latest IS video comes after the militants released footage earlier this month showing the gruesome burning alive of a Jordanian fighter pilot besides beheading two Japanese hostages, drawing international condemnation and outrage.