A bomber struck inside a mosque packed with worshippers during morning prayers in the town of Mubi.
A suicide bomb blast at a mosque in north-eastern Nigeria has killed at least 50 people, according to local media reports.
"This is obviously the work of Boko Haram". The group is based in neighboring Borno state and has been blamed for scores of similar attacks over the years.
He added that, "While no group has claimed responsibility for this today's deadly attack, it bears all the hallmarks of the Boko Haram atrocities documented over the years by Amnesty International".
"As people converged on Massalacin Madina at Anguwan Shuwa to observe Subh (morning prayer), an unknown man rammed himself into the mosque with IEDs [improvised explosive device], killing many people", a resident told the Premium Times.
Nigeria's military, with help from regional allies, have succeeded in pushing the jihadists out of territory captured in 2014 and 2015.
Donald Trump Says He Should Have Left UCLA Players Jailed In China
In actual college basketball news, Ball, Hill and Riley have been indefinitely suspended from the team . They will not travel with the team or suit up for home games.
Yan St-Pierre, a counter-terrorism specialist at the Modern Security Consulting Group in Berlin, said the bombing fitted a pattern of previous attacks.
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.
No-one has said they were behind the bombing but the Islamist militants Boko Haram typically target crowded places in northern Nigeria.
He said, "This wanton and deliberate targeting of civilians must end".
Boko Haram fighters killed six farmers outside Maiduguri, the civilian militia and the brother of one of the victims said on Monday.
Boko Haram has been blamed for more than 20,000 deaths during its eight-year-old insurgency.