On 17 January 2017, a Nigerian Air Force jet mistakenly bombed an internally displaced persons camp near the Cameroonian border in Rann, Borno State. They had believed it was a Boko Haram encampment. From Wikipedia
The attack near the border with Cameroon highlights escalating violence by Boko Haram and ISWAP, with militants adopting new tactics like armed drones and IEDs.