Jacob Zenn, an analyst with The Jamestown Foundation in Washington wrote a good piece on Boko Haram in the 14 January 2013 issue of the
CTC Sentinel. While it focuses primarily on Nigeria and Boko Haram links in the Sahel region, it provides some evidence of cooperation between Boko Haram and al-Shabaab. Zenn argues in
Boko Haram's International Connections that Boko Haram received training in Somalia from al-Shabaab, which led to the suicide bombing of the Federal Police headquarters and the UN headquarters in Abuja, Nigeria.
