Ed Miliband MP, Leader of the Labour Party, said:
“The killing by ISIL of another hostage and the threat of more violence demonstrates again their murderous barbarism.
“Their cold-blooded brutality against the innocent offends the values of people throughout the world, wherever they live.
“This shows, as we have recently have said, that they are a threat which cannot be ignored.
“Our thoughts are with the families of the victims.”