African Union forces from Chad have attacked Boko Haram killing 120 of its militants in the far north of Cameron.
The Islamist militant group had recently launched a cross-border advance from its stronghold in Nigeria into neighbouring Cameron and Chad.
Nigeria and its four neighboring countries Benin, Cameroon, Chad and Niger have committed 7,500 troops to a multinational force to fight the militants.
The UN secretary general Ban Ki-moon offered his support for the African Union’s task force to address the threat from the Islamist group.
“Like al-Qaeda, Boko Haram and ISIS all these terrorists, they have committed unspeakable brutality against humanity. Not a single country, even the regional countries cannot handle this alone,” Ban said.
Boko Haram has killed thousands in its struggle to create an Islamic state in northern Nigeria.