The federal government has condemned the execution of Hauwa Leman, an aid worker with the International Committee of the Red Cross (ICRC), by The Islamic State West Africa Province (ISWAP), a faction of Boko Haram.
Nigerian Information and Culture Minister Alhaji Lai Mohammed said on Monday the government was "deeply pained" by news of the killing, but added it would "keep the negotiations open and continue to work to free the innocent women who remain in the custody of their abductors".
Leman, a nurse with the International Committee of the Red Cross (ICRC), was kidnapped by the armed group in March along with two other medical workers in Rann, Borno State in the country's northeast.
Following the death however Mohammed issued a statement, saying: "It is very unfortunate that it has come to this".
Buhari had called the killing of Khorsa "an act of extreme barbarism; utterly reprehensible and inhuman".
"According to the President, Nigeria needs the ICRC and the government will continue to do all it can to protect staff of the organisation and other aid workers that are providing much-needed humanitarian services in the North East region, which had been affected by nearly a decade-long conflict".
The presidency tweeted "that the federal government did all within its powers to save her life".
TheCable had reported how Leman was killed on Monday. A midwife working with us in northern Nigeria.
Since March 1, the ICRC has repeatedly made representations to the government of Nigeria about the abducted healthcare workers, at different levels.
According to the President, Nigeria needs the ICRC and the government will continue to do all it can to protect the staff of the organisation. Liman and Loksha were kidnapped, as was another aid worker, Sifura Khorsa.
On its website, on Sunday, the ICRC had appealed to "the Nigerian government and to communities and individuals with influence to work toward the release of two committed medical workers abducted in north eastern Nigeria earlier this year". "Speed and urgency are critical", it wrote.
"Hauwa dedicated herself to serving the victims of Boko Haram's insurgency, and it is extremely sad that her life ended the way it did, at the hands of the terrorists". We have been told in 24 hours they will be executed.
He said: "It is painful that the atrocities of Boko Haram have been allowed to linger under President Muhammadu Buhari and the ruling All Progressives Congress (APC) despite their promises and claims that Boko Haram has been "technically" defeated".
Meanwhile, the federal government has expressed shock over the killing of Hauwa Leman by the Boko Haram terrorists.