TIFE OWOLABI Armed attackers killed six people at a police station in southern Nigeria, a police spokesman said on Sunday, bringing the total number of officers killed over the weekend to 12 amid escalating violence nationwide. The attack early on Saturday morning in Akwa Ibom state killed five officers and one of their wives, spokesman Odiko Mcdon told Reuters. The killings followed three attacks on Friday night in the southern oil hub of Rivers state where seven officers were killed. Rivers is the home to Port Harcourt, the gateway to the oil-rich Delta region - while Akwa Ibom state is…