In September, a Cable reporter viewed a videotape released by ISWAP showing Ahmed on camera wearing a white hijab when she was shot from behind.
"It is painful to note that despite efforts by the Federal Government who opened a negotiation channel immediately and put all possible efforts on table to secure an agreeable bargain for the safe release of the abductees, unfortunately, Mr Speaker, the Boko Haram sect took a terrible path of executing these helpless and selfless voluntary health workers who gave their time on earth for the care and wellness of devastated Boko Haram victims", he added.
The military outpost in Borno state houses about 80,000 refugees displaced by the nine-year-long Boko Haram insurgency.
Attempts to reach Mohammed were also unsuccessful, as he failed to pick his calls or respond to a text message from The Guardian.
"It is very unfortunate that it has come to this". Before and after the deadline issued by her abductors, the federal government did everything any responsible government should do to save the aid worker.
We are not sure of the exact time or hour when it expires, but are extremely anxious for lives of the Hauwa and Alice. "This is an utterly awful situation to be in".More news: Syria calls for int'l investigation into U.S. coalition's "crimes"
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Nigeria's military and government have repeatedly said they are on the point of defeating Boko Haram and its various factions.
Asked to comment on government's response as the deadline drew near, Mosimann answered: "The Nigerian government has assured us of their full commitment to the resolution of the crises".
The ICRC last weekend appealed for the captives' release and for the jihadists to show mercy, as they were "doing nothing but helping communities" in the conflict-riven region. "Speed and urgency are critical", it wrote.
"Saifura and Hauwa were killed because they are considered as Murtads (apostates) by the group because they were once Muslims that have abandoned their Islam, the moment they chose to work with the Red Cross, and for us, there is no difference between Red Cross and Unicef", the Boko Haram said in a release late Monday.
"We are concerned that many people in the region will not have access to medical support if the region becomes too risky for staff to operate", Aleksandra Mosimann, a spokeswoman for the ICRC, told the New York Times. I implore the Federal Government to deploy every reasonable tool at its disposal to bring Leah Shuaibu and all the children in Boko Haram captivity home.