"Egypt is able to defeat terrorism; because it does that not only to defend itself, but also to defend the humanity," the president said in his televised speech late on Sunday.     

Terming the beheading of the Christians as 'vicious', the Egyptian president said a new series of terrorism is spreading across the world and demanded that all people come together to fight it.

During his speech, el-Sisi offered his condolences to the families of the dead even as he ordered the government to strictly ban Egyptians from travelling to Libya and asked to facilitate the return of others from there.

The President also added that he has ordered the National Defence Council, country's top security body, to be holding permanently.

He also asked the Foreign Minister to travel to New York and participate in the "fighting terrorism" summit.

Earlier in the day, Egypt announced a seven-day mourning period over the beheading.

A five-minute video was release yesterday purportedly showing masked IS militants beheading 21 Coptic Christians, who were kidnapped in Libya a month ago.

The gruesome video showed masked men dressed in black while leading a group of men (the 21 Egyptians) in orange jumpsuits with their hands tied behind their backs at the Tripoli beach in Libya.

A masked militant, the only one who is not dressed in black, speaks fluent English with a foreign accent is heard saying, "Oh people, recently you've seen us on the hills of Al-Sham [the Levant] and on Dabeq's Plain, chopping off the heads that had been carrying the cross delusion for a long time, filled with spite against Islam and Muslims, and today we are sending another message: oh crusaders, safety for you will be only wishes."

The IS militants in the video are further shown decapitating the hostages with one of them saying towards the end of the clip: "The sea you've hidden Sheikh Osama Bin Laden's body in, we swear to Allah we will mix it with your blood."

The Egypt government had previously adviced its citizens not to travel to Libya, however, thousands of Egyptians have travelled there in search of jobs.

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