An audio message allegedly from the head of Nigeria’s Boko Haram terror group Saturday pledged the group’s allegiance to ISIS.

Catherine Herridge reported on "Fox and Friends Weekend" that the U.S. intelligence community is analyzing the recording, but as of now, it should be taken at face value.

"It was posted by the group's leader, Abubakar Shekau, and over the past six months, there has been increasing evidence that he has been aligning himself with, at least philosophically, the Caliphate in Iraq and Syria," Herridge said.

She explained that now it is about waiting for a response from ISIS leader Abu Bakr al-Baghdadi, likening this to a freshman claiming he's going out with the prom queen.

"You've got to hear from the prom queen to see if that's really the case," Herridge said.

"The bottom line this morning is that you have this group in West Africa saying that it's definitely on the same page as the group in Iraq and Syria."

She noted a previous report that more than a dozen ISIS members had relocated from Iraq and Syria to Libya, explaining that part of their purpose is to be a link between militant groups in Africa and the Middle East.

"It's increasingly beginning to look like a global franchise," Herridge said. "They're in Algeria, they're in Libya, we had that former Guantanamo detainee who was recently killed in Afghanistan ... and then we also have West Africa."

"So you see this, what I loosely describe as, is this arc of instability that stretches from east and now effectively into the west."

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