An explosion has hit the Nigerian capital, Abuja, near the scene of a deadly bomb attack last month.
The blast happened in Nyanya, close to the motor park where at least 70 people died in an attack on 14 April.
Initial reports say a number of people have been killed and many more have been injured.
Correspondents say it was caused by a car bomb. The Islamist militant group Boko Haram has previously staged attacks Abuja.
One eyewitness told the BBC he saw 20 bodies at the scene.
No group has claimed responsibility for the blast.
Campaign of violence
Most of Boko Haram’s attacks have been in the north-east of Nigeria.
But the bombing on 14 April raised fears that the militants could be trying to expand their area of operation.
The BBC’s Will Ross in says the latest blast comes at a terrible time for Nigeria, which is also dealing with the the abduction of 230 schoolgirls that happened hours after the previous Nyanya attack.
Boko Haram’s fighters have killed more than 1,500 civilians in three states in north-east Nigeria this year.
It has hit Abuja several times before, including an attack on the United Nations building in 2011.
But before 14 April, there had not been an attack in the capital for two years, our correspondent says.
The Nigerian government had said the violence was contained in a small area of the north-east.
Boko Haram, whose name means “Western education is forbidden” in the local Hausa language, has been waging a campaign of gun and bomb attacks since 2009.
Credit: BBC