Soldiers are seen on a truck in Maiduguri in Borno State, Nigeria

Soldiers are seen on a truck in Maiduguri in Borno State, Nigeria May 14, 2015. At least six civilians and six members of a youth vigilante group were killed in an attack by Boko Haram militants on Nigeria’s northeastern city Maiduguri, two military sources said on Thursday. REUTERS/Stringer