Two suicide bombers killed at least 22 worshippers at a mosque in northeastern Nigeria on Wednesday, the military said.
The attack in Ummarari village, on the outskirts of the city of Maiduguri, was carried out by "two females," military spokesman Sani Usman said in a statement.
The first bombing struck the mosque while the second occurred minutes later some 50 metres away, he said, adding that at least 18 other people were wounded.
Troops and security officers had secured the area and were "combing the environment for possible clues," while the injured were taken to hospital, Usman said.
Isah Salihu, a witness at the scene who put the number of dead at 25, told dpa that the explosions occurred during early morning prayers.
Security at the mosque was scaled down only two days ago following a growing feeling that the insurgent group Boko Haram no longer posed a risk to worshippers, Salihu said.
A female suicide bomber disguised as a man detonated one bomb inside the mosque, Nigeria's Daily Trust newspaper said.
When rescuers rushed to the scene, the other bomber detonated her explosive device, it reported.
Boko Haram, a Nigeria-based group that seeks to implement its own radical version of Islam, has killed thousands in Nigeria, Cameroon, Niger and Chad since 2009.