No less than six persons were killed when four teenage female suicide bombers attacked the Muna garage area in the outskirts of Maiduguri, the Borno State capital, in the early hours of Wednesday.
Al-Barnawi and six other co-accused persons, including his second wife, are accused of kidnapping and killing a British national, Christopher McManus and other foreigners working in Nigeria in 2012.
An intelligence report by the United States Army on Boko Haram recently de-classified has revealed that the group is principally funded by a consortium of international terror organisations, with al-Shabaab and al-Qaeda being the major financiers.
Spokesman of NEMA in the North East, Abdulkadir Ibrahim, in a statement on Thursday said the return of the victims of Boko Haram insurgency was as a result of an agreement between Nigeria, Cameroun and Niger for the safe and dignified return of Nigerians who fled to the countries for safety.