The former Vice President said killing the missionary was a barbaric act.
While the three others namely Alanna Carson, David Donovan and Shirley Donovan were released after negotiations with the British High Commission and Nigerian authorities, Squire was not so lucky to make it out alive.
Taking to his Twitter account (@atiku) on Tuesday, November 7, 2017, Atiku said the act was barbaric and sickening.
He tweeted, "Saddened by the killing of Ian Squire, the British missionary by kidnappers. This barbaric event must be condemned. Missionaries and volunteers have been partners for education in Nigeria for centuries. That anyone would think of hurting them is sickening."
According to Chief Theo Fakama, from the local Enukorowa community, the four were working with a Christian medical charity and had been providing "free medical care and religious activities" in the Burutu area of Delta state.
Atiku also took time minutes later to condemn the 'cowardly' attack by terrorist group, Boko Haram, in his native Adamawa state on Monday, November 6.
He tweeted, "The attack on innocent people by Boko Haram terrorists deserves continued condemnation and action. The latest attack on Adamawa is cowardly!"
In the attack, terrorists invaded Gulak, the headquarters of Madagali Local Government Area of Adamawa state, and opened fire on residents who fled into nearby bushes, mountains, and hills.
The attack happened only a day after two male suicide bombers entered the home of a family in Tsilah village near Madagali and held a woman and her daughter hostage before they detonated the explosives strapped to their bodies, killing themselves and hostages.