Violence across several states in northeastern Nigeria resulted in Causation more than 1,000 dead , with around 700 killed in the city of Maiduguri alone , according to one military official .

A government inquiry Criminal_investigation later found Know that , while long-standing tensions existed Presence between Boko Haram and the Nigerian Security forces , the immediate cause Causation of the violence stemmed Causation from a confrontation Hostile_encounter between a group of sect members and police in the city of Maiduguri .

Nigerian troops surrounded Surrounding the home of Ustaz Mohammed Yusuf , the founder and spiritual leader of Boko Haram since 2002 , in Maiduguri on 28 July after his followers had barricaded Having_or_lacking_access themselves inside .