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(NEWSER) – Algerian extremists allied with the Islamic State group have decapitated a French hostage after France ignored their demand to stop airstrikes in Iraq, according to a video released by terrorism watchdog SITE Intelligence Group.

A group calling itself Jund al-Khilafah said after abducting Herve Gourdel on Sunday that he would be killed within 24 hours unless France ended its airstrikes against Islamic State fighters in Iraq. The French government has insisted it will not back down. SITE distributed a video by Jund al-Khilafah today announcing Gourdel's death. Gourdel was a 55-year-old mountaineering guide from Nice seized in the mountains of northern Algeria.

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PHOTO: Getty Images