Officials from the UN Office for the Coordination of Humanitarian Affairs (OCHA) delivered 30 tonnes of "various lifesaving food items" transported from neighbouring Cameroon, the OCHA said in a statement yesterday.
The convoy reached Banki on Thursday and distributed food to the more than 25,000 people in the town, it said.
"An additional 700 kilograms of supplementary food for malnourished children was airlifted from the state capital Maiduguri to Banki on the same day".
They have been without food and basic supplies and relied on paltry food handouts from soldiers who have been sharing their rations.
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Last month a soldier and a vigilante assisting the military in fighting Boko Haram told AFP at least 10 people were dying from hunger every day, highlighting warnings about a food crisis in the Sahel region.
The vigilante said the cemetery in Banki, some 130 kilometres southeast of the Borno state capital Maiduguri, was dotted with 376 graves of displaced people who died of starvation.
When Boko Haram intensified attacks on villages in the area, residents fled to Banki where a military detachment has been based since they retook it in September.
The United Nations said in May that 9.2 million people living around Lake Chad, which forms the border of Nigeria, Chad, Cameroon and Niger, were in desperate need of food.
According to the OCHA aid distribution in Banki and other areas recently liberated by the Nigerian military was "scaling up" but more funds were needed to meet the "lifesaving needs" of people affected by Boko Haram violence in northeast Nigeria.
The Borno state government and aid agencies have warned about acute food shortages in the Lake Chad region as a result of seven years of violence.
Boko Haram's insurgency has left at least 20,000 dead in Nigeria and devastated infrastructure in the impoverished northeast. The unrest has also displaced more than 2.6 million.