The Obama administration is concerned following news that the Islamic State has accepted a pledge of allegiance from Boko Haram, possibly leading to the establishment of a caliphate in Africa.
Nigeria has been reporting some success in battling back Boko Haram, with reports of South African mercenaries conducting night-time attacks against the group.
U.S. State Department spokesperson Jen Psaki says Washington is worried, but suspects this is primarily a propaganda announcement.
IN: "We're aware...
OUT: ...rhetorical support."
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