U.N.I.C.E.F. also accused the Nigerian army of detaining suspected children without any psychological support.
Aisha Buhari says she won't back the president in next election if he fails to revamp the government.
More than 270 girls were kidnapped by Boko Haram militants in 2014.
Nigerian air force carried out a series of airstrikes in the village of Taye, inside the Sambisa forest in Borno State, killing at least three senior commanders of Boko Haram on Friday.
Inquiry commission accuses army of mass killings in Kaduna state.
Violence forces thousands to leave their homes in crisis-hit Nigeria.
Soldiers were ambushed on way back to base after a successful raid.
U.N.I.C.E.F. says thousands on verge of dying in absence of immediate aid.
Severe food crisis in north-east claims hundreds of lives every day.
Kills 35 Boko Haram militants and frees 97 hostages in Borno state.
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