Suicide attacks by two female bombers at a crowded market in northern Nigeria's Maiduguri city have killed 78 people, medical officials say.
One teenage girl blew herself up first and as people gathered to help victims, the second girl detonated herself, witnesses say.
One man told the BBC he heard loud sounds as the bombs exploded.
Militant Islamist group Boko Haram is waging an insurgency in Nigeria.
It was based in Maiduguri, the capital of Borno state, after its formation in 2002, but it has since been driven out of the city by the military and vigilante groups.
'Bomber screamed'
It now controls a large number of towns and villages in Borno, amid fears that it is preparing to launch an assault to capture Maiduguri.
Boko Haram has not commented on the explosions.
It has been blamed for at least five female suicide bombings in Nigeria since June.
The girls, dressed in full hijab, entered the busy market and detonated their explosives, said Abba Aji Kalli, the coordinator of a government-backed vigilante group in Borno, AP news agency reports.
The first bomber killed about three women, he said.
When people gathered at the scene, the second bomber screamed and blew herself up, killing about 30, Mr Kalli added.
One teenage girl blew herself up first and as people gathered to help victims, the second girl detonated herself, witnesses say.
One man told the BBC he heard loud sounds as the bombs exploded.
Militant Islamist group Boko Haram is waging an insurgency in Nigeria.
It was based in Maiduguri, the capital of Borno state, after its formation in 2002, but it has since been driven out of the city by the military and vigilante groups.
'Bomber screamed'
It now controls a large number of towns and villages in Borno, amid fears that it is preparing to launch an assault to capture Maiduguri.
Boko Haram has not commented on the explosions.
It has been blamed for at least five female suicide bombings in Nigeria since June.
The girls, dressed in full hijab, entered the busy market and detonated their explosives, said Abba Aji Kalli, the coordinator of a government-backed vigilante group in Borno, AP news agency reports.
The first bomber killed about three women, he said.
When people gathered at the scene, the second bomber screamed and blew herself up, killing about 30, Mr Kalli added.
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