Kano - Two would-be suicide bombers were killed in Maiduguri on Monday, after apparently trying to target an overnight Ramadan vigil, a civilian vigilante and a local resident said.
"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 disclosed.
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.
"While they were arguing, one of them perhaps lost his patience and set off his explosives. Shortly afterwards, the second bomber also went off."
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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.
At the weekend, the Nigerian Army claimed it had freed 5,000 "hostages" during operations in Borno, where the Islamists are believed to have taken refuge.
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.