Witness Abubakar Sule told AFP news agency that it appeared the bomber was part of the congregation. "The group has used children as young as five to carry out hundreds of attacks on busy marketplaces, checkpoints and mosques in the past few years", the British newspaper said.
No group has claimed responsibility for the attack so far.
The latest Global Terrorism Index, published last week, said that deaths attributed to Boko Haram in 2016 fell by 80 percent.
In a statement on Tuesday AI Nigeria Director Osai Ojigho lamented the attack that killed at least 59 people in Mubi, northeast Nigeria.
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The government has also instructed colleges to establish a dedicated fund with net savings from the strike. The province has noted that strike-related support will not count against a student's OSAP assessment.
Noting the current moves by the IGP to review police personnel and strategy in the state, the president directed him to visit the state and report back his findings about the deadly attacks.
"All parties to the ongoing conflict in northeast Nigeria, including Boko Haram, are bound by the rules of global humanitarian law, which explicitly prohibits any direct attacks against civilians and civilian objects".
ReutersAdamawa state in northeastern Nigeria have now been liberated from Boko Haram by government forces, but many buildings, homes, churches and schools have been destroyed and sporadic attacks continue.
The town's name was changed temporarily to Madinatul Islam, or "City of Islam" in Arabic, during the Boko Haram occupation.
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Boko Haram held territory in Adamawa state in 2014.
There have been repeated raids and suicide bombings, blamed on Boko Haram remnants pushed out of their camps in the Sambisa Forest.
Boko Haram fighters are also said to be hiding in the Mandara mountains, which forms the border of Adamawa and Nigeria with neighbouring Cameroon, where there has also been more attacks.
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