Two female suicide bombers blew themselves up in an internally displaced persons (IDP) camp in northeastern Nigeria, killing at least 60 people, military and emergency officials said on Wednesday.
The deadly attack took place 85 km (50 miles) outside the capital of Borno State on Tuesday but a malfunction in the telephone network obstructed the assault being made public earlier, the officials said.
The two female suicide bombers infiltrated into the IDP camp and blew themselves up inside it, the officials added.
The chairman of the State Emergency Management Agency, Satomi Ahmad, indicated that 78 people were wounded in the attack.
There was no immediate claim of responsibility but the attack bore the hallmarks of Boko Haram.
Boko Haram has recently raised the frequency of its attacks, carrying out three at the end of January. At least 65 people were killed in a previous attack in the northeastern Nigerian city of Maiduguri on Jan. 31.
Boko Haram was formed in 2009 and has killed hundreds of civilians through the years in numerous African countries including Niger, Chad and Cameroon.
The militant group has reverted to a strategy of attacking soft targets such as markets, bus stations and places of worship, and also using hit-and-run tactics during its attacks on villages.
In the past six years some 17,000 people have been killed by the militant group, while its armed campaign has caused around 2.5 million people to flee the area.