Two female Boko Haram suicide bombers blew themselves up and gunmen then attacked civilians in the town of N'Guigmi, said mayor.
Defence ministry says more than 200 militants were killed in air strikes and a further 87 by ground troops since a military offensive began on December 28.
Two blasts ripped through the town of Damboa in Borno state on Saturday evening targeting people returning from celebrating the Eid al Fitr holiday, in an attack bearing all the hallmarks of Boko Haram.
Cameroon's semi-arid Far North region has been a target of Boko Haram suicide bombings and raids for eight years as the insurgency spilled over the border from Nigeria, killing 20,000 and uprooting nearly 3 million in the Lake Chad region.
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At least three women suspected to be from Boko Haram detonated their explosives at a camp for displaced people in northeastern Borno state.
There has been no claim of responsibility for the attack in Cameroon's Far North region, which is a routine target of Boko Haram suicide bombers.
The suicide bombings which took place in northern Bourvare village hosting a refugee camp is believed to be carried out by two children. Officials blamed Boko Haram rebel group for the deadly attack in which 30 others were wounded.
The African nations surrounding Lake Chad cannot afford to wait for the international community to respond to the humanitarian disaster unfolding in the region. The Lake Chad crisis is an African question that requires an African response.
Daesh-affiliated Boko Haram is leading a nine-year long insurgency against the governments of Nigeria, Niger, Cameroon and Chad. The ongoing humanitarian crisis has resulted in more than 20,000 deaths and displaced 2.4 million people.
It's been three years since the kidnapping of 276 schoolgirls from Chibok in northern Nigeria. Boko Haram continues to be at the forefront of a nine year-long insurgency, creating one of the biggest humanitarian crises in the world.
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