A major terror group pledges allegiance to ISIS.
Egyptian militants, who until now had been solely fighting their government are taking up the cause. The group calls on "god's chosen fighters" to join what they call the war against Islam.
"In obedience to God and his prophet, who warned against division among his people, we are announcing our allegiance to the Caliphate," militant said in audio recording.
The group is considered Egypt's most dangerous militants. Dissatisfied with al Qaeda, they are now turning to ISIS. The affiliation is expected to provide new money, weapons, and soldiers.
There's also concern the group could adopt ISIS tactics of terrorizing civilians and tourists with indiscriminate killings and beheadings.
Experts say it's a major victory for ISIS in the propaganda war.
But ISIS isn't only gaining support in Egypt. CNN's Jim Sciutto has more on how far ISIS' global reach extends.