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UN chief remembers 23 killed in Boko Haram suicide car bomb at Nigeria HQ, promises solidarity

  • U.N. Secretary General Ban Ki-Moon, lays a wreath at the U.N headquarters in Abuja to remember his colleagues that were killed four years ago by a suicide car bombing in Abuja Nigeria Monday, Aug. 24, 2015. (AP Photo/Gbemiga Olamikan)

    U.N. Secretary General Ban Ki-Moon, lays a wreath at the U.N headquarters in Abuja to remember his colleagues that were killed four years ago by a suicide car bombing in Abuja Nigeria Monday, Aug. 24, 2015. (AP Photo/Gbemiga Olamikan)  (The Associated Press)

  • Nigeria President Muhammadu Buhari, left, meets with U.N Secretary General Ban Ki-Moon, at the Presidential Villa  in Abuja Nigeria Monday, Aug. 24, 2015. U.N. Secretary-General Ban Ki-moon paid tribute Monday to 23 colleagues killed four years ago in a Boko Haram car bombing at his organization’s Nigeria headquarters. Ban  promised solidarity in the new Nigerian leader’s fight against insecurity, unemployment and corruption. (AP Photo/Azeez Akunleyan)

    Nigeria President Muhammadu Buhari, left, meets with U.N Secretary General Ban Ki-Moon, at the Presidential Villa in Abuja Nigeria Monday, Aug. 24, 2015. U.N. Secretary-General Ban Ki-moon paid tribute Monday to 23 colleagues killed four years ago in a Boko Haram car bombing at his organization’s Nigeria headquarters. Ban promised solidarity in the new Nigerian leader’s fight against insecurity, unemployment and corruption. (AP Photo/Azeez Akunleyan)  (The Associated Press)

  • U.N. Secretary General Ban Ki-Moon, meets with women and children at a health centre in  Abuja Nigeria Monday, Aug. 24, 2015. The Secretary General  met Nigerian President Muhammadu Buhari and promised solidarity in the new Nigerian leader’s fight against insecurity, unemployment and corruption. (AP Photo/Gbemiga Olamikan)

    U.N. Secretary General Ban Ki-Moon, meets with women and children at a health centre in Abuja Nigeria Monday, Aug. 24, 2015. The Secretary General met Nigerian President Muhammadu Buhari and promised solidarity in the new Nigerian leader’s fight against insecurity, unemployment and corruption. (AP Photo/Gbemiga Olamikan)  (The Associated Press)

U.N. Secretary-General Ban Ki-moon pays tribute to 23 colleagues killed four years ago in a Boko Haram car bombing at his organization's Nigeria headquarters.

Ban is meeting with President Muhammadu Buhari and promises solidarity in the new Nigerian leader's fight against insecurity, unemployment and corruption.

His visit comes as a regional army is preparing a long-delayed offensive against Nigeria's Islamic extremists. The 6-year-old uprising has killed 20,000 people, including more than 1,000 this year.

Ban laid a wreath Monday at the U.N. offices where a suicide car bomber smashed through the barrier and exploded into the reception on Aug. 26, 2011, killing 23 people. He was to meet later Monday with some of the 60 wounded who he said suffered terrible injury and trauma.