Bauchi - A suicide bomber attacked a Catholic church conducting mass in the northern region on Sunday, injuring and killing an unknown number of people in a region under assault by a radical Islamist sect.
A report said that a journalist had heard the explosion on Sunday morning in Bauchi, which has seen a number of bombings and shootings blamed on the sect known as Boko Haram.
The blast appeared to hit a parking lot alongside the St John's Catholic Church in the city.
Police and military surrounded the church and did not allow journalists inside the cordon.
Yushau Shuaib, a spokesperson for Nigeria's national emergency management agency, said a suicide bomber had targeted the church.
"Rescuers have evacuated the dead and injured," Shuaib said.
Boko Haram has been waging an increasingly bloody fight against nation's weak central government.
More than 680 people have died in drive-by killings and bombings blamed on Boko Haram this year alone.
The sect has demanded the release of all its captive members and has called for strict sharia law to be implemented across the entire country.