A car loaded with explosives crashed into the main U.N. building in Nigeria's capital and exploded Friday, killing at least 18 people in one of the deadliest assaults on the international body in a decade.
A radical Muslim sect blamed for a series of attacks in the African country claimed responsibility for the bombing, a major escalation of its sectarian fight against Nigeria's weak central government.
The brazen assault in a neighborhood surrounded by heavily fortified diplomatic posts was the first suicide attack to target foreigners in oil-rich Nigeria, where people already live in fear of the radical Boko Haram sect. The group, which has reported links to al-Qaida, wants to implement a strict version of Shariah law in the nation and is vehemently opposed to Western education and culture.
A sedan loaded with explosives crashed through two gates at the exit of the U.N. compound Friday morning as guards tried in vain to stop it, witnesses told the Associated Press. The suicide bomber drove the car through the glass front of the main reception area and detonated the explosives, inflicting the most damage possible, a spokesman for the Nigerian National Emergency Management Agency said.
At least 18 people died in the attack, according to an AP survey of morgues at four major Abuja hospitals. Nigerian Health Minister Mohammad Ali Pate made a public appeal for blood donations, saying at least 60 injured people were at the nearby National Hospital.
Of the 18 killed, 15 were U.N. personnel, a spokesman said.
The headquarters, known as U.N. House, had offices for about 400 employees working for 26 U.N. humanitarian and development agencies. Authorities worked Friday to account for everyone in the building at the time of the blast.
U.N. Secretary-General Ban Ki-moon called the car bombing "an assault on those who devote their lives to helping others."
U.S. President Obama called the attack "horrific and cowardly" and expressed strong support for the U.N.'s work.
"The people who serve the United Nations do so with a simple purpose: to try to improve the lives of their neighbors and promote the values on which the U.N. was founded -- dignity, freedom, security and peace," Obama said.
"An attack on Nigerian and international public servants demonstrates the bankruptcy of the ideology that led to this heinous action."
The explosion punched a huge hole in the building, located in the same neighborhood as the U.S. embassy and other diplomatic posts in Abuja. Workers brought three large cranes to the site within hours of the attack, trying to pull away the concrete and rubble to find survivors.