David Cameron has condemned the "sickening murder" of a Jordanian pilot burned to death by Islamic State (IS) group extremists.
The British Prime Minister said the barbaric act would "only strengthen" the resolve of the international community to defeat the militants.
A video posted online appears to show Lieutenant Moaz al Kasasbeh standing in a cage before being set on fire.
The pilot was captured by IS when his plane came down near their Raqqa stronghold in Syria in December while on a mission supporting US-led air strikes.
Jordanian state TV confirmed the death, suggesting he was actually killed a month ago.
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Posting on Twitter, Mr Cameron said: "Lieutenant Moaz al Kasasbeh's sickening murder will only strengthen our resolve to defeat ISIL (IS). My prayers are with his family tonight".
