Emergency services say rescuers are working through the rubble of the school in central Plateau state.
His resignation comes a day after the Kenyan president sacked most of his cabinet.
Both Equatorial Guinea and Morocco tried to persuade the Spanish-born teenage sensation to play for them.
Authorities impose curfew in the volatile Tillaberi region after inmates escape from a major prison.
A selection of the week's best photos from across the African continent.
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