Gamboru is across the border from the Cameroonian town of Fokotol, where Cameroonian and Chadian forces are joining up to attack Boko Haram, Cameroonian officials told the agency.
Earlier on Saturday, African leaders meeting for the African Union' Peace and Security Council, which endorsed by UN Secretary General Ban Ki Moon, AP reported.
Boko Haram is a militant group, which aims at establishing an Islamic state in northern Nigeria. Large swathes of land in the Borno State, as well as in neighboring Adamawa and Yobe are believed to be under control of the Islamists. The Boko Haram insurgency has left over 13,000 people dead since 2009.
The Nigerian army launched an operation against the group in 2013, but the effort has stalled, although a national security advisor previously told BBC the country doesn't believe that there is a need for help from UN or African Union troops. Boko Haram continue attacking targets within the country as it prepares for national elections on February 14.
On January 4, Boko Haram militants captured the town of Baga in Borno State, reportedly killing hundreds. "The human carnage perpetrated by Boko Haram terrorists in Baga was enormous," Muhammad Abba Gava, a spokesman for a local defense group that fights militants, told the Associated Press. Reports emerged that approximately 2,000 people, mostly women, children and the elderly, were killed, according to Amnesty International.
