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At least one person was killed and three others injured on Monday after a suicide bombing at a military checkpoint in Maiduguri, capital of northeastern Nigeria’s Borno state, a security source said.

According to a security officer who pleaded for anonymity, the suicide bomber, who was a passenger in a commuter bus, blew up himself after other passengers had disembarked from the vehicle in adherence to routine check by security operatives who mounted a roadblock at Njimtilo, some 10 km away from the Maiduguri business district.

The suicide bomber detonated the explosive devices as the security checks were ongoing, killing the driver of the commercial vehicle, the source added.