File photo shows a bomb attack on the police headquarters in the Nigerian city of Abuja.
At least seven people have been killed in a bombing that targeted a police headquarters in the northern Nigerian state of Borno, the Nigerian Red Cross says.
The incident occurred on Friday when a bomber attempted to drive his explosive-laden car into the police headquarters in Borno’s capital, Maiduguri.
A police official said the bomber tried to force his way into the police headquarters, but the car hit the sand-filled drums outside the building and exploded.
"We have some casualties, but we're trying to sort out the extent of fatalities and the injured," the source said.
Witnesses, however, reported seeing the bodies of two policemen and five more officers who were wounded in the blast.
The northeastern city of Maiduguri has been the hotbed of militancy by Boko Haram extremists. The insurgency has killed more than 1,000 people since mid-2009.
The group's mosque and headquarters were located in Maiduguri until they were destroyed in a 2009 military assault.
The city has seen additional security measures, including checkpoints and traffic restrictions, especially following an attempted bombing attack in August on the state police headquarters, which was foiled by authorities.