source: Vanguard (Nigeria)
actor1: Police Forces of Nigeria (2015-)
actor2: Islamic State (West Africa) and/or Boko Haram - Jamaatu Ahli is-Sunnah lid-Dawati wal-Jihad
location: Lagos
notes: 20 December. Police forces arrested Boko Haram leader Umar in his hideout in Lagos. He is accused of being the mastermind behind the 2015 Abuja bombing