Militants kill15 soldiers and four militia fighters after attacking their convoy in northeastern Borno state, security sources say. Meanwhile, search continues for dozens of students kidnapped in northwestern Kaduna state.
A spokesman for UN chief Antonio Guterres confirmed only that there was a "security incident", but gave no further details.
Four soldiers and seven hunters recruited to fight insurgents were killed when their vehicle hit landmines in northeastern Borno state.
UN revises death toll from initial 43 as residents bury scores of victims following a massacre allegedly by Boko Haram militants in northeastern Borno state.
A splinter group of Boko Haram stormed Kukawa, taking hostage hundreds of residents whose fate remains unknown even after the army says it's retaken control.
An official said explosives that were fired from outside the city "landed on separate sites."
Insurgents fired rocket-propelled grenades at a lorry carrying troops as it travelled near Gorgi village in Borno state, two military officers said without giving their names.
Mercy Corps says it's suspending operations in Borno and Yobe states after Nigerian military shut four of its field offices. Separately, Daesh-linked militants executed one of six captive aid workers of Action Against Hunger.
Locals say militants targeted a funeral on Saturday in northeastern Borno state, epicentre of Boko Haram and Daesh insurgency.
More than 40 people were also wounded when three unidentified bombers struck in the northeast state of Borno where villagers were watching a football match on TV, officials and villagers say.
Three suicide bombers targeted a fish market in the northeast city of Maiduguri, the epicentre of the Boko Haram insurgency. Nobody has claimed responsibility for the attack so far.
Residents of Magumeri town in Northeast Nigeria say they fled to a nearby forest as the militants came in firing randomly and lobbing explosive devices.
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