10 killed in Nigeria violence BANKI, Nigeria, April 12 (UPI) -- A police officer, an immigration officer and three civilians were killed by gunmen in northeast Nigeria, and police killed five gunmen, officials said. Officials said the attack occurred about 7 p.m. Tuesday when about 30 gunmen invaded Banki town in the Borno State and set fire to Customs and Immigration services outposts in the area, the Daily Trust reported. Bala Hassan, Borno State police commissioner, said the gunmen tried to attack a Banki police station but were stopped by officers, who killed five of the attackers in a shootout. Hassan said police recovered two AK-47 rifles, 12 rounds of ammunition and one of the vehicles used by the gunmen. Banki is in the Bama Local Government Area, which is under a state of emergency imposed by Nigerian President Goodluck Jonathan in December after violence by Islamist extremist group Boko Haram. Authorities did not blame any group for the Tuesday attack.