source: Vanguard (Nigeria)
actor1: Islamic State (West Africa) - Lake Chad Faction
actor2: Military Forces of Nigeria (2015-)
location: Biu
notes: On 23 December 2019, ISWAP militants moved towards Biu (Biu, Borno) and got engaged in a battle with Nigerian Armed Forces. Artillery was used and an unreported number of ISWAP fighters were killed. Unknown number of fatalities coded as 10.