Multiple blasts have rocked camps for internally displaced people in the North-eastern Nigerian city of Maiduguri. Two blasts took place at camps for Nigerians fleeing Boko Haram's insurgency. That's according to Borno State Police Commander Damian Chukwu. At least four people have been killed and nearly 20 others injured in the attacks. All of the suicide bombers involved in the attacks have been killed. Boko Haram has been waging an insurgency in the region for years now. It's believed the ISIL-affiliated group has killed at least a hundred thousand people over the years.