Updated

An online video purportedly shows a Jordanian pilot captured by the Islamic State extremist group being burned to death.

The Associated Press was not immediately able to confirm the authenticity of the video, which was released on militant websites and bore the logo of the extremist group's al-Furqan media service.

Lt. Muath al-Kaseasbeh, 26, fell into the hands of the militants in December when his Jordanian F-16 crashed near Raqqa, Syria, the de facto capital of the group's self-styled caliphate. He was the first pilot from the U.S.-led coalition to be captured.

Following militant demands, Jordan's government had said it was willing to trade Sajida al-Rishawi, an al-Qaida prisoner, for the pilot. Al-Rishawi faces death in Jordan for her role in a 2005 hotel attack that killed 60 people.