An explosion has hit the outskirts of Nigeria's capital Abuja, just meters away from the site of a bomb blast that left 75 people dead less than a month ago. Witnesses say several people have been killed.
According to Reuters news agency a large number of people were killed on Thursday when an apparent car bomb was detonated close to a bus station outside the city.
Some sources put the death toll at nine, although others say it could be much higher.
Civil Corps Defense spokesman Eman Ekeh said rescue services had rushed to the scene.
Islamist militant group Boko Haram claimed responsibility for the attack which struck the same area on April 14.
On the same day suspected Boko Haram militants kidnapped at least 230 girls from a high school in the northern Borno state. Around 50 of the girls managed to escape within hours of the abduction, but most are still missing.
The group, whose name means "Western education is sinful," has been held reponsible for hundreds of attacks across the country during its five-year insurgency.
Earlier on Thursday President Goodluck Jonathan told a May Day rally in the capital that the government will "triumph over all this evil that wants to debase our humanity or obstruct our progress as a nation."
"Those who want to re-define our country to be seen as a country of chaos will never succeed," he said.