The Islamic State West Africa Province on Friday claimed it has executed four male humanitarian workers in their captivity.
The victims, who work with Action Against Hunger, had been abducted since July 2019.
The only female among them, Grace Taku, according to ISWAP, has been condemned to a life of slavery.
Ahmad Salkida, known to have strong intelligence on the terror group, confirmed the story in a post on Twitter.
It was reported that they were abducted in July along Gubio/ Damasak Highway in Borno State.
Taku had in recent past appealed to the Federal Government and Christian Association of Nigeria to save her life.
Recall that last weekend the terrorist group also executed three persons believed to be a policeman and army personnel.