A huge explosion has rocked a Mosque located inside a market in Maiduguri, the Borno State capital, killing many people.
The explosion occurred at about 3:30p.m while Muslim traders where observing the late afternoon prayers.
Witnesses said the bomb went off seconds after worshippers commenced their congregational prayers.
The number of fatalities was unclear.
The attack came less than a day after Boko Haram militants launched an intense grenade attack on the city, killing about 17 people just hours after Nigeria swore in Muhammadu Buhari as its new president.
Mr. Buhari has vowed to confront Boko Haram, a deadly jihadist group responsible for several thousands of deaths.
At his inauguration, the president said he will relocate the military command structure to Maiduguri until the group is subdued.