Chad and Nigeria have used fighter jets as part of a regional alliance to defeat the Islamist group that has recently escalated its deadly attacks on Nigeria and its neighbors . Nigeria denies it flew any sorties in the area on day in question . - The US has not confirmed that a drone was shot down by Nigerian forces, but says they are investigating reports of an attack. Resident who helped bury dead says 37 people were killed .
Nigeria denies it flew any sorties in the area on day in question . - The US has not confirmed that a drone was shot down by Nigerian forces, but says they are investigating reports of an attack. Resident who helped bury dead says 37 people were killed .