The blast is said to have been carried out by a teenage suicide bomber, said reports.
Military and civilian militia sources in the northeast said the attack was likely to have been in response to recent increased ground and air operations against Boko Haram.
"It was a (suicide) bomber who mingled with worshippers".
"It was when the prayers were on that he set off his explosives". "We don't suspect anyone specifically but we know those behind such kind of attacks".
It has killed more than 20,000 and forced around 2 million people to flee their homes.
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Also, Mr Haruna Hamman-Furo, Executive Secretary of the Adamawa State Emergency Management Agency (ADSEMA) also confirmed that 15 people were killed and several others injured due to the blast. However, a reporter on the scene said the death toll was no more than 27, all men and boys.
"The roof was blown off", one witness, who lives nearby the house of worship, told the news service Agence France-Presse.
The attack took place in Mubi, in Adamawa State, during morning prayers, local media has reported.
"This is obviously the work of Boko Haram".
"It fits with the increasing lethality and potency of suicide attacks of the organization's current "hot streak", which started approximately four weeks ago", counterterrorism specialist Yan St-Pierre said.
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Border Patrol agent and the serious injury of another", the governor's office said Monday in a news release . Ted Cruz (R-Texas) released a statement using Martinez's name to share his condolences.
The latest Global Terrorism Index, published last week, said that deaths attributed to Boko Haram in 2016 fell by 80 percent.
"All parties to the ongoing conflict in northeast Nigeria, including Boko Haram, are bound by the rules of worldwide humanitarian law, which explicitly prohibits any direct attacks against civilians and civilian objects".
People gathered at the site of a suicide attack in Maiduguri, Nigeria, Thursday, Nov. 16, 2017.
He added: "Mubi is not far away from ... the epicentre of the Boko Haram insurgency". During the occupation, the town's name was changed temporarily to Madinatul Islam, or "City of Islam" in Arabic.
On November 19, Boko Haram bases in the Njimiya, Parisa and Gulumba areas near the Sambisa Forest of Borno state were hit by air strikes, leading to "heavy losses", he claimed. The extremists' offensive has also spilled over into neighboring Chad, Niger and Cameroon.
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However, Argentina's navy will take advantage of better weather conditions Tuesday and continue searching for the submarine. The ARA San Juan submarine, with 44 crewmen on board, last communicated with their command base on November 15.