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The BBC's Bashir Sa'ad Abdullahi says all of the glass at the front of the building has been blown out. At least 16 people have been killed in an apparent suicide car bombing at the UN building in the Nigerian capital Abuja. The powerful blast destroyed the lower floors of the building. Dozens have been injured, some critically. A UN official in Nigeria, who spoke to the BBC on condition of anonymity, said the UN had received information last month that it could be targeted by Islamist group Boko Haram. Security was stepped up in response. A car bombing at police headquarters in June was blamed on Boko Haram, a group which wants the establishment of Sharia law in Nigeria.No group has said it carried out Friday's attack, but government officials have blamed "terrorists" for the bombing, says the BBC's Bashir Sa'ad Abdullahi, who is at the site of the explosion. Analysts say that the scale and target of the attack could point to a link with international terror groups. But investigators are yet to examine the evidence and a UN spokesman reiterated that it was not clear who was responsible. 'Shock on faces' Police have sealed off the area and our correspondent there says that although rescue work is ongoing, the major search operation has been completed. Cranes have been brought to the blast site to move the mass of rubble and ensure that no-one is trapped there. Witnesses said the blast happened when a car rammed the front of the building after crashing through two security barriers. Nigeria's Minister of State for Foreign Affairs Viola Onwuliri told the BBC she had visited the building and seen "the shock on people's faces". "This is not an attack on Nigeria but on the global community," she said. "An attack on the world." The building is the UN's main office in Nigeria, where all its agencies are based. It is said to be the headquarters for about 400 UN employees but it is not clear how many were inside the building at the time of the attack. An unnamed UN official said security had been increased at all UN offices in Nigeria following the intelligence warning of a possible attack. 'Scattered bodies' Friday's attack took place at about 1100 local time (1000 GMT) in the diplomatic zone in the centre of the city, close to the US embassy.There was a loud explosion and smoke billowed from the building following Friday's powerful blast, which shattered all the glass in the building and demolished part of the concrete wall. Our correspondent said the ground floor of the building was badly damaged and he saw the emergency services removing dead bodies from the building while a number of wounded were rushed to hospital. "I saw scattered bodies," Michael Ofilaje, a Unicef worker at the building, said according to the Associated Press news agency (AP). "Many people are dead." He said it felt like "the blast came from the basement and shook the building". Local hospitals are said to be overwhelmed with the number of injured and have appealed for blood donations.