Amnesty International has condemned in strong terms the alleged killing of 13 protesters by security personnel across Nigeria. It described the development as “unjustified and unacceptable”. In a statement on Friday, issued by its Country Director, Isa Sanusi, the organisation urged the Nigerian authorities to investigate the incidents impartially and effectively and ensure that security personnel suspected of responsibility for the alleged deadly use of force were held to account through fair trial. The organisation noted the situations in Suleja, Niger State, where six persons were killed an…