Witnesses say two suicide bombers killed an Air Force officer at a checkpoint in a late-night attack in Nigeria’s northeastern city of Maiduguri.

They blamed the attack on Boko Haram Islamic extremists responsible for a slew of such attacks that have killed hundreds this year in Nigeria and neighboring Cameroon, Chad and Niger.

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Tuesday night’s explosion occurred hours after Nigeria’s military ordered officers to report for duty to a new multinational army based in N’Djamena, Chad’s capital, to launch a long-delayed offensive against Nigeria’s home-grown insurgents.

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A self-defense fighter said a lieutenant died and a woman was injured when two suicide bombers approached a checkpoint and one exploded. He insisted on anonymity because he was not authorized to speak to the press.

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