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By Paul Carsten
ABUJA (Reuters) - Around 1.8 million people are at risk of starvation in northeast Nigeria, victims of an Islamist insurgency that is undermining efforts by the World Food Programme (WFP) to ferry in aid, it said on Friday.
The Boko Haram insurgency has killed more than 15,000 people since 2009 and forced some two million from their homes. The Nigerian army, backed by neighbours, has retaken most areas held by the group, but it has recently stepped up attacks and suicide bombings.
Aid groups entering the region in recent months have warned that shortages of food, shelter and medical care were threatening refugees with widespread famine and disease.
WFP executive director Ertharin Cousin said in all an estimated 4.4 million people were in need of food assistance in the northeast, though the full scale of the crisis was still unknown as some areas remained unreachable.
"The challenge is that there are areas in (Boko Haram heartland) Borno state in particular that are still inaccessible, and we have no idea of the food security situation (there)," she told Reuters.
Even in parts of the northeast held and defended by the army, Boko Haram attacks were jeopardising aid programmes, Cousin said.
In January, the WFP failed to reach some 300,000 people of the 1.3 million targeted because of bombings of camps for internally displaced people and attacks on markets.
The executive director told reporters a colleague who visited areas recently recaptured from Boko Haram compared the state of women and children there to images of people liberated from Auschwitz and other Nazi concentration camps in World War II. Friday marks International Holocaust Remembrance Day.
"I am imploring the international community to continue to provide us with the support that is necessary," said Cousin.
Ending the insurgency will require a political as well as a military solution, Cousin told Reuters, adding: "Until we resolve those issues the humanitarian situation will not improve to a level that allows us to reach all of those in need."
The government has told aid agencies it expects the conflict to end in six months, she said.
There have been no signs that Nigeria's government has engaged with Boko Haram, which seeks to establish an Islamic caliphate in the northeast, on a political level.
(editing by John Stonestreet)