A bomb explosion has ripped through the busy Musa Usman Secretariat Main Gate in Maiduguri, Borno State, killing at least four people and wounded several others, residents said.
Rescue workers were seen carrying four bodies away.
The attack in the city centre bore the hallmark of the jihadist group, Boko Haram, which has been waging an insurgency in the north for seven years.
It was the second suicide bombing attack in 12 hours.
On Wednesday, troops of 7 Division Garrison Command of the Nigerian Army, in conjunction with the Civilian JTF maintaining security and vigilance, frustrated a suicide bombing of Sulaimanti, in the outskirts of Maiduguri city.
The terrorist carrying Improvised Explosive Device (IED), attempted to attack worshippers at Sulaimanti mosque during early morning prayer.
He was however prevented from gaining access to the mosque. Five civilians sustained injuries during the failed attempt.
A team of specialists on Explosive Ordinance Device (EOD) have successfully detonated the remaining IEDs and combed the area.
The injured had since been evacuated to the hospital while troops and security agents have intensified patrol within the general area.
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