"Reactingly quickly, the government`s forces were able to push them back. Most of the Boko Haram elements have been neutralized," said one of the officers, based in the Diffa border region.
"The situation is under control and we are carrying out clean-up operations," he added.
Boko Haram has ramped up cross-border attacks into Niger, Chad and Cameroon from its strongholds in northeastern Nigeria in recent months.
Almost a third of Diffa`s nearly 600,000 inhabitants have been displaced by the violence.
A long-awaited 8,700-troop-strong regional task force is set to begin joint operations soon against the Islamist fighters when the region`s rainy season ends, a top United Nations official said late last month.
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