In a statement, the Nigerien army said it has killed 100 jihadists in an operation in a south-western region near the Burkina Faso border.
The operation held in the Torodi area and followed an attack that killed 19 security officers on a resupply mission on 31 July.
Another team that later came to rescue was hit by an explosive device.
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The Nigerien army said it had aimed to “search for and neutralise” those responsible for the ambush and bomb attack.