actor1: Police Forces of Nigeria (1999-2015)
actor2: Unidentified Armed Group (Nigeria)
notes: The Deputy Controller of Sokoto State Central Prisons, Usman Zaki Gwandu, was yesterday killed in Sokoto metropolis by unidentified gunmen with unclear motive.
target_text: actor1: Police Forces of Nigeria (1999-2015), actor2: Unidentified Armed Group (Nigeria)