The President, in a statement by Senior Special Assistant on Media and Publicity, Garba Shehu, enjoined the people in the entire North-east to be more vigilant and report suspicious persons to security agencies in order to avert further attacks on soft targets by the terrorist group.
Bloody debris covered the floor inside the mosque in Mubi town in Adamawa state where worshippers had arrived around 5 a.m. One of the police said that together with other believers inside the mosque penetrated 16-17-year-old boy wearing an explosive belt.
Abubakar Othman, a police spokesman in Adamawa state, said the death toll is at least 50 but "there could be more as those seriously injured could add to the figure".
While Nigeria's military in recent months has flushed Boko Haram from its forest stronghold, President Muhammadu Buhari's claim late previous year that the extremist group had been "crushed" has proven to be premature.
Boko Haram has killed more than 20,000 people since waging an insurgency war in northeast Nigeria since 2009.
"This year Boko Haram has killed 357 civilians during 55 attacks in northeastern Nigeria".
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The police spokesman said the young man detonated his explosives while mingling among the worshippers. "The deadliest month was in August, when the militant group killed 100 people, followed by November, with 76 people killed already", he said.
Mohammed Asheik, from the Civilian Joint Task Force assisting the military with security in the northeast, said: "Our people went to the farm to work".
Mubi is in Adamawa state where Boko Haram held territory in 2014.
The town's name was changed temporarily to Madinatul Islam, or "City of Islam" in Arabic, during the Boko Haram occupation.
There have been repeated raids and suicide bombings, blamed on Boko Haram remnants pushed out of their camps in the Sambisa Forest area of Borno.