"There were two explosions outside the mosque on the Damboa Road this morning but luckily no deaths were recorded apart from the two bombers," militia member Babagana Kolo told AFP.
Kolo and a local resident both said the bombers were disguised as worshippers wanting to attend the "Tahajjud" or night prayer at the mosque but were stopped by security.
"The civilian joint task force (vigilante) didn't let them enter because he wasn't comfortable with them - and he was right," said the resident, who asked not to be identified.
Both men said only the vigilante was injured. Prayers were abandoned at the mosque but continued elsewhere in the Borno state capital, said Kolo.
The incident underlines the continued threat from Boko Haram, despite assertions from Nigeria's military that the Islamists have been severely weakened and even "technically defeated".
Boko Haram has repeatedly used suicide bombers against civilian "soft" targets such as mosques in the past, as part of its seven-year campaign to create a hardline Islamic state.
But independent verification was impossible, with the area inaccessible for security reasons.
The civilians are likely to have been living in areas under Boko Haram control and unable to move because of the military operations against the militants.
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