A media account affiliated with the Islamic State group has released a statement on Friday that claims a female American hostage held by the group was killed in a Jordanian airstrike in Raqqa, Syria.

The message, which was translated by the SITE Intelligence Group, identified the hostage as Kayla Jean Mueller.

"The Failed Jordanian Aircraft Killed an American Female Hostage," the statement claimed.

U.S. officials said last year that a 26-year-old American woman was being held by the extremists after having been kidnapped in the Syrian city of Aleppo. They asked not to identify her out of fears for her safety.