A teenage suicide bomber detonated his device as worshippers gathered for morning prayers at a mosque in north-eastern Nigeria, police said, killing at least 50 people. There was no claim of responsibility.
He said the attack targeted Muslims worshipers performing morning prayers.
Police spokesman Abubakar Othman said the death toll was at least 50 but could rise "as those seriously injured could add to the figure".
The Islamist militant group Boko Haram is being blamed for a suicide bombing that occurred early Tuesday. Last December, two schoolgirl suicide bombers killed 56 people and wounded dozens more at a market in Adamawa.
The incident was the first in three years since the liberation of Mubi town from Boko Haram insurgents in 2014.More news: The Next Rainbow Six Siege Operators Are Insane; Co-op Mode Announced
But St-Pierre said despite this "Boko Haram remains an extremely potent and risky organisation" which was far from being "on the back foot", as the military and government has claimed.
Boko Haram has been blamed for more than 20,000 deaths during its almost decade-old insurgency, which has spilled over into neighbouring countries and displaced millions of people, creating a vast humanitarian crisis.
The other faction is based in the Lake Chad region and led by Abu Musab al-Barnawi.
Sunday's attack in Lawanti village, in the Jere area of Borno state, again underlined the threat posed by the group to people outside heavily-fortified towns and cities. The group held a swathe of land around the size of Belgium in Borno, Adamawa and Yobe states until early 2015 but were forced out by Nigeria's army backed by troops from neighbouring countries.