Nigeria's president has promised to bring terrorism under control, during a visit to the scene of Friday's bombing at the UN's headquarters in Abuja.
Goodluck Jonathan said it had been not just an attack on Nigeria, but an attack on the international community.
The radical Islamist group, Boko Haram, told the BBC it was behind the blast in the capital, which left at least 23 people dead and 81 wounded.
Mr Jonathan said the group was a "local problem" that had to be dealt with.
Boko Haram, which is fighting for the establishment of Sharia law in Nigeria, is alleged to have had contacts with al-Qaeda in the Islamic Maghreb, which operates in North Africa, and al-Shabab in Somalia.
http://www.bbc.co.uk/news/world-africa-14696446
Note: Update Record,28 August 2011 Last updated at 11:29 GMT