An airstrike suspected to be from the Nigerian Air Force killed at least 21 members of a civilian defence group as they responded to an attack by gunmen in Niger state, witnesses said on Wednesday. Authorities have not said who was responsible for the strike, which residents described as coming from a drone, according to Daily Mail. Ayuba Lagodo a member of the civilian defence group that tries to protect villagers, said a drone strike hit shortly after residents reported an attack underway in Galadimakogo.