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By Buhari Bello and Lanre Ola JOS/BAUCHI, Nigeria (Reuters) - Boko Haram bombers killed 23 people on Thursday, authorities said, as the Islamist insurgents fight back against a military offensive launched by Nigeria and three neighbouring countries. A suicide bomber at a bus station in Biu, a town in northeastern Borno state, killed at least 17 people, a military source and local vigilante Ibrahim Jaton said. "The whole spot was scattered within minutes." Suicide bombings have become a common tactic for Boko Haram in the last year as the group expanded its control over territory in Africa's biggest oil producer and top economy. A spate of Boko Haram attacks on civilians in the past few days seem aimed at striking back.