Diffa - Two Chadian army helicopters bombed Boko Haram positions on Sunday, killing several dozen militants near Djaboullam on the border with Niger, a senior Niger military official told Reuters.
Niger and Chadian soldiers have been fighting the Islamist militants in a joint mission with Nigeria and Cameroon since March 2, in a bid to end Boko Haram's six-year insurgency in northern Nigeria that is threatening regional stability.
The helicopters destroyed several vehicles and motorcycles carrying fighters in the village of Djaboullam, which lies east across the border from the Niger town of Diffa, the Niger officer said.
"Niger and Chad had received intelligence that a group of Boko Haram fighters had gathered in the border village," the officer said.
Also read: Chad troops return to town after Boko Haram kill 11
The Niger military officer, who requested anonymity, said Boko Haram fighters had moved to Djaboullam after they were chased from other towns by the Nigerian army. Militants were also gathering in other border towns from where they routinely launch mortar rounds into Niger, he said.
"We know they are massing in Malam Fatori, waiting for us to come," he said, referring to another northeast town about three kilometres from Bosso, the nearest town across the border in Niger.
The regional offensive has succeeded in driving the militants from several towns and districts they previously held. Chad and Niger forces captured the town of Damasak from the militants last week.