NEW : More than 2,500 women , kids freed from militants ' compound , official says . There is a history of religious violence in central Nigeria , where majority-Muslim North Africa meets largely Christian sub-Saharan Africa . 400 flee fighting between militants , government in northern Nigeria . More 400 people killed in Muslim violence , Ojukwu official says . Militants holed up at base of operations in Maiduguri , Maiduguri .
NEW : More than 2,500 women , kids freed from militants ' compound , official says . 400 flee fighting between militants , government in northern Nigeria . More 400 people killed in Muslim violence , Ojukwu official says . Militants holed up at base of operations in Maiduguri , Maiduguri .