Wakilin UNICEF a Najeriya Mohamed Malick Fall ya bayyana cewa, taron tuna wa da garkuwa da ‘yan matan Chibok bayan shekaru 4 na nuna yadda ‘Yan ta’adda ke jefa rayuwar yara kanana cikin mawuyacin hali a yankin arewa maso-gabashin Najeriya.
