When Boko Haram pledged official allegiance to ISIS in an audio statement this weekend, the Nigerian militant group's message came as no surprise to most analysts. What the move means — and who stands to gain — is far less clear. Here's a look at what we know and what questions remain unanswered.
Boko Haram has been signalling a shift towards the ISIS model for jihad — and group itself — for months, from displaying the militants' black flags in videos to mirroring their rhetoric and tactics.
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