An apparent car bomb attack on Thursday killed at least 19 people and injured many more in the Nigerian capital, Abuja, police say.
The blast happened in Nyanya suburb, near a motor park where at least 70 people died in a blast on 14 April.
Witnesses said the explosion occurred close to a police checkpoint.
No group has claimed responsibility for Thursday’s attack. The Islamist militant group Boko Haram said it was behind the fatal explosion last month.
The BBC’s Will Ross in Abuja says Nyanya is a religiously mixed area and it is not clear why the area has been targeted.
Fears over security
Charles Osueke, who was in the area at the time of the blast, told the BBC that it was just 200m (650ft) away from the 14 April explosion.
“People in the crowd were saying that a man parked his car, walked away and the next thing they know, the car blew up,” he said.
“I’m worried about our security here. After the last explosion the president said he would increase security,” Mr Osueke added.
“There were policemen around when this explosion happened and they didn’t manage to stop it.”
The head of Nigeria’s Emergency Management Agency, Abbas Idriss, told the BBC that 19 people were killed in the blast and 60 others were injured.
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.
In a video message after that attack, the group’s leader Abubakar Shekau said: “We are in your city but you don’t know where we are.”