The militant group ISIS have killed the fourth captive and second British national, and have threatened to behead another captive in the most recent video to be released.

Alan Henning, mirroring the previous videos, is seen kneeling with his captor and is forced to give a statement before the ISIS member beheads him as we have seen in the previous three videos.

“Obama, you have started your aerial bombardment of Shams [Syria], which keeps on striking our people, so it is only right that we continue to strike the neck of your people,” the masked militant said.

Henning himself is forced to say “Because of our parliament’s decision to attack the Islamic State, I, as a member of the British public, will now pay the price for that decision,” A male voice is then heard to say, “The blood of David Haines was on your hands Cameron,” in a reference to Britain’s prime minister. “Alan Henning will also be slaughtered, but his blood is on the hands of the British parliament.”

The black clad man, who appears to be the same man who has administered the previous three beheadings, has also named the potential next victim. American, Peter Edward Kassig.

David Cameron has said, following this latest attack, that the “brutal murder” of aid worker Alan Henning by Islamic State “shows just how barbaric and repulsive these terrorists are”, and vowed to “do all we can to hunt down these murderers and bring them to justice”.

The Labour leader Ed Miliband has also released a statement saying “The murder of Alan Henning by ISIL is appalling and barbaric. He was an aid worker, helping those in need. Those who killed him have revealed only their lack of humanity and brutality. My thoughts and deepest condolences are with his wife Barbara, his children and all those who knew him.”

As Miliband has stated, this was a man who devoted his life to helping people; but that does not make this most recent attack any more heinous than what we have already seen from ISIL. The original videos being released made demands of the western countries these men were taken from. There are no longer demands. These are no longer acts of terror. These are executions of prisoners of war.

These are acts condemned by every country the world over. These men are not combatants. They did not harm the families of these militants, nor the countries they are in. The madness must stop. The killing of innocents must stop. The men who remain in captivity have to be brought home. We have to get them back.