Oklahoma executions: US state to use nitrogen to gas death row inmates, despite method deemed 'unsuitable for euthanising mammals'

Oklahoma has announced plans to use nitrogen gas to execute death-row prisoners, as states struggle to find alternatives to their dwindling supplies of lethal injection drugs. The Midwestern state would be the first in the US to use the procedure, for which protocol has yet to be established. The decision came after a number of drug manufacturers barred their products from being used in lethal injections, leaving states with a shortage of options.