Purported leader of militant group threatened more raids.
President made a surprise visit in wake of mass killings by Boko Haram.
Officials say army taking actions to restore order in besieged town.
Oil giant agreed to a $84M settlement for two oil spills in Niger Delta.
Seizure of base indicates military is losing ground against insurgency.
Air force jets bombed Greek-operated oil tanker, killing two.
Oppo asked the High Court to annul new law, saying it risked turning Kenya into a dictatorship.
Veteran politician Beji Caid Essebsi has been confirmed as winner of Tunisia's first free presidential poll.
Official says Nigeria and neighbors in "good shape" to address issue.
Satellite images suggest high death toll from recent attacks.
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