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Nigerian military official: Extremists detonate 3 explosions in Borno state capital

  • Victims receive treatment at a hospital, after an explosion in Maiduguri, Nigeria Monday, Sept. 21, 2015. Extremists detonated three explosive devices on Sunday in Maiduguri, the capital of Borno state, in Nigeria's northeast, a military official said Sunday. (AP Photo/Jossy Ola)

    Victims receive treatment at a hospital, after an explosion in Maiduguri, Nigeria Monday, Sept. 21, 2015. Extremists detonated three explosive devices on Sunday in Maiduguri, the capital of Borno state, in Nigeria's northeast, a military official said Sunday. (AP Photo/Jossy Ola)  (The Associated Press)

  • Victims receive treatment at a hospital, after an explosion in Maiduguri,  Nigeria Monday, Sept. 21, 2015. Extremists detonated three explosive devices on Sunday in Maiduguri, the capital of Borno state, in Nigeria's northeast, a military official said Sunday.  (AP Photo/Jossy Ola)

    Victims receive treatment at a hospital, after an explosion in Maiduguri, Nigeria Monday, Sept. 21, 2015. Extremists detonated three explosive devices on Sunday in Maiduguri, the capital of Borno state, in Nigeria's northeast, a military official said Sunday. (AP Photo/Jossy Ola)  (The Associated Press)

  • People gathered shoes  at the site of last night's explosion in Maiduguri, Nigeria Monday, Sept. 21, 2015. Extremists detonated three explosive devices in Maiduguri, the capital of Borno state, in Nigeria's northeast, a military official said Sunday. (AP Photo/Jossy Ola)

    People gathered shoes at the site of last night's explosion in Maiduguri, Nigeria Monday, Sept. 21, 2015. Extremists detonated three explosive devices in Maiduguri, the capital of Borno state, in Nigeria's northeast, a military official said Sunday. (AP Photo/Jossy Ola)  (The Associated Press)

A Nigerian military official says extremists have detonated three explosive devices in Maiduguri, the capital of Borno state, in the country's northeast.

Military spokesman Col. Sani Kukasheka Usman said Sunday that didn't have any details on casualties.

No group has claimed responsibility for the attack but the initial suspicion has fallen on the Islamic extremist group Boko Haram, which has resorted to hit-and-run tactics after the Nigerian military has recaptured territory once held by the militants.

Usman says the attacks signify the increasing desperation of Boko Haram terrorists. At least 20,000 people have been killed in Boko Haram's six-year-old uprising.