Ban suspects that followers of an ultra-extremist ISIS faction known as "Hazimiyoun" played a role or were behind the mosque attack. It may also be possible that other ISIS militants carried it out, feeling pressure from the Hazimiyoun faction's rising power to show they are not "soft." There has been no claim of responsibility for the Sinai attack, and it is impossible to confirm that the faction did have a role. Some ISIS leaders seen as infidelsEven before the attack, Egyptian newspapers reported the emergence of the Hazimiyoun faction in Egypt. He said the mosque attack was "certainly the work of one of IS factions.

Source: CBC News December 02, 2017 11:04 UTC