Two female suicide bombers blew themselves up in a northeast Nigerian refugee camp, killing at least 56 people.
Some reports say more than 60 people have been killed.
Health and rescue officials say a further 78 people are being treated for wounds in the camp, which houses around 50,000 refugees.
The attack reportedly took place on Tuesday, but a breakdown in the telephone system prevented the information from being made public earlier.
Officials blamed Boko Haram for the bombings at Dikwa, 55 miles northeast of Maiduguri, the biggest city in the region - and birthplace of Boko Haram.
Boko Haram's six-year insurgency has killed around 20,000 people and made around 2.5 million homeless.
Additional reporting by AP