A video published online by Islamic State (IS) militants claims to show Jordanian pilot Moaz al-Kasasbeh being burned alive, according to a BBC report.
The video, which could not immediately be verified, showed a man standing in a cage and engulfed in flames.
Lt Moaz al-Kasasbeh was captured when his plane came down near Raqqa, Syria, in December on a mission to support the US-led military coalition against IS.
Jordan has been attempting to secure his release as part of a prisoner swap.
The video was distributed via a Twitter account known as a source for IS propaganda.