Maiduguri - Suspected Boko Haram militants are attacking Nigeria's northern city of Maiduguri in Borno state from a cashew plantation a few kilometres from the Giwa barracks, a military source said.
Residents said they heard heavy shooting on the outskirts.
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"I'm trapped near the University of Maiduguri now," local resident Kabir Olaoye told Reuters by phone. The shooting began around 6:45 pm (1745 GMT) local time, he said.
The city of around 2 million people is the birthplace of the Islamist jihadi group, which has killed thousands in its attempt to carve out an Islamist state in the country's northeast.