Lagos - President Goodluck Jonathan is ordering all schools and non-essential government offices in Abuja to close during an international conference as a precaution against terror attacks.
The order on Friday night follows a car bombing at a busy security checkpoint on Thursday that killed at least 19 people and wounded 66 in Abuj. The blast was near the site of a 14 April explosion that killed 75 people.
Abuja is hosting the World Economic Forum on Africa 7 - 9 May with international personalities, business and African leaders. Chinese Premier Li Keqiang is guest of honour.
The bombings were blamed on the Boko Haram terrorist network that has attacked schools and slaughtered hundreds of students.
The militants are holding some 276 teenage girls abducted from a north-eastern school 15 April.