Six blasts and gunfire rocked the Nigerian city of Maiduguri on Thursday, residents and a military source said, after explosions and shooting earlier broke out in another northeastern city.
"There has so far been six explosions, and four of them in the same area," the military source said, adding that a shootout had also occurred.
Gunfire and explosions had earlier broken out in Damaturu. Both cities have previously been badly hit by violence blamed on the Islamist group Boko Haram.
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