Twenty-eight people were wounded in the attack, including 20 soldiers, said the statement by government spokesman Lionel Bilgo. The army had said in a previous statement that dozens of trucks were destroyed.
The assault took place in the commune of Gaskinde in Soum province, where jihadists linked to al Qaeda and Islamic State have escalated attacks and seized territory since 2015.
Militants have blockaded several areas, so government convoys and air drops have delivered essential goods to trapped civilians.
The convoy, which was under military escort, was carrying supplies to the town of Djibo, just over 20 km (12 miles) away from Gaskinde.
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