Boko Haram wing tied to IS marks resurgence by kidnapping oil workers
None
A Boko Haram faction with ties to Islamic State and responsible for the kidnapping of a Nigerian oil prospecting team which led to at least 37 people being killed has become a deadly force capable of carrying out highly-organised attacks.
Nigerian government forces have focused on crushing the best-known branch of the Islamist militant group whose leader Abubakar Shekau has led an eight-year insurgency to create an Islamic state in the northeast which has killed thousands.
But while Nigeria has claimed the capture of Shekau's main base in the Sambisa forest and freed many of more than 200 schoolgirls abducted by his faction in April 2014 in Chibok town, a rival wing has developed the capacity to carry out attacks on a larger scale.
