According to reports, it has not been confirmed if any ransom was paid to secure their release, following a negotiation with the insurgents.
The humanitarian workers, two females and three males, were abducted on December 22.
A gang of gunmen believed to be Boko Haram terrorists ambushed their convoy en route to Maiduguri from Monguno in Borno.
The victims are George Michael, International Organisation for Migration, (IOM); Jennifer Samuel of Alliance for International Medical Action (ALIMA); Arthur Chima, Solidarity International, Asabe Musa, ALIMA; and Adamu Ozeshi, Red Cross.
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A security source revealed to Premium Times that the victims arrived at the DSS office in Maiduguri at about 4 pm on Wednesday, January 15, 2020.
“They are in good health and are being debriefed at our command in Maiduguri,” a security source said.