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.
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.
According to the UN, tens of thousands of children in northeast Nigeria will die of malnutrition this year unless they receive treatment soon
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