A video circulated online by social media accounts believed to be linked with Islamic State militants, purports to show people in the Syrian city of Raqqa watching and cheering the execution of Jordanian pilot, Mouath al-Kasaesbeh on a large projection in a public square.
The execution video released on Tuesday showed 28-year-old Kasaesbeh burning alive, trapped in a metal cage by the militants.
His remains were then crushed by debris and rubble dropped from a digger.
An opposition group in the city confirmed that the public screening of the video took place.
In the video of the public viewing, traffic appears to continue to run while a small crowd watches the projection from the square below.
Raqqa is the Islamic State's self-declared capital, the group took the city and eliminated rival Syrian rebel groups from the area in early 2014.
The group, an offshoot of al-Qaida rapidly seized territory in Syria and Iraq early last summer, before declaring a caliphate across territory it controls.
Jordan's King Abdullah vowed a "relentless" war against Islamic State on their own territory on Wednesday in response to Tuesday's execution video.
Jordan hanged two Iraqi jihadists, one a woman, on Wednesday and vowed to intensify military action against Islamic State.
Jordan, which is part of the US-led alliance against Islamic State, had promised an "earth-shaking response" to the killing of its pilot, Mouath al-Kasaesbeh, who was captured in December when his F-16 warplane crashed over north-eastern Syria, while he was flying a mission against Islamic State.