Police say the toll has risen to at least 19 killed in a car bomb that exploded on a busy road in Nigeria's capital, just days before the city is to host a major international conference.

The bomb exploded where traffic built up near a checkpoint across the road from a busy bus station where a massive explosion on April 14 killed at least 75 people. That blast was claimed by the Islamic extremist Boko Hararm terrorist network.

Thursday night's bomb comes days before Abuja is to host the World Economic Forum on Africa, with Chinese Premier Li Keqiang as an honored guest.

Police Superintendent Frank Mba said Friday the toll is up to 19 dead with as many wounded being treated in the hospitals. Six cars were burned up.