A statement posted on a website sometimes used by Isis fighters and their supporters said that Kayla Mueller, 26, had been killed by a missile strike during a bombing raid by Jordanian planes on the Syrian city of Raqqa early on Friday.
Mueller was said to have been killed when rockets partially destroyed the building in which she was being held, the statement said, adding that no Isis fighters were killed in the attack.
Several pictures of a damaged building complex were included in the statement which they said showed the aftermath of the air strike, but the claim that Mueller had been killed could not be independently verified.
“The criminal crusader coalition planes targeted sites outside Raqqa city today at noon while people were performing Friday prayers,” the message read.
“The raids continued on the same site for more than an hour. God has disappointed their endeavours and foiled their plot by not hitting any jihadi man thank God.”