A suicide bomber died and killed another person after they detonated explosives at a government building in the northeast Nigerian city of Maiduguri on Thursday.

At least 19 other people were also injured in the blast, according to Abdullahi Umar, an information officer at the Borno State Emergency Management Agency. The attack happened about 12 p.m. in the State Secretariat in the Post Office area of town, he said by phone from the city. The bomber pretended to be a staff member to gain entry to the building, but was turned back by security before setting off the explosives, Umar said.

While Islamist militant group Boko Haram is in the seventh year of a violent campaign to impose its version of Islamic law in Africa’s biggest economy, its has increasingly resorted to using suicide or child bombers as the insurgent’s capacity and hold on territory in the northeast has been eroded by the military over the past year.

French President Francois Hollande, along with presidents from Nigeria’s neighbors, Benin, Cameroon, Chad, and Niger, will attend a summit in the country’s capital Abuja on Saturday that’s meant to find a regional response to the security threat posed by militants in West and Central Africa.

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