In a video released late on Saturday,  April 17, a North Sinai Coptic Christian named as 62-year-old Nabil Habashi Salama is shot dead at point-blank range

An Islamic State affiliated group has claimed the execution of a Coptic Christian and two tribesmen in Egypt's restive Sinai, in a video posted on its Telegram channel.

The Coptic Church, which makes up between 10 and 15 per cent of Egypt's 100-million population, on Sunday, April 18, named the Christian killed as Nabil Habashi Salama, according to AFP.

"He kept the faith till the moment he was killed," the group Sinai Province said in a statement.

In a 13-minute video released late on Saturday, the 62-year-old Copt from Bir al-Abd in North Sinai is shot dead at point-blank range by a militant flanked by two others carrying rifles.

"As for you Christians of Egypt, this is the price you are paying for supporting the Egyptian army," the militant who executed the man said in the video.

Two young Sinai tribesmen were also seen being killed in a barren, desert landscape, with the militants accusing them of fighting alongside the Egyptian military.