Islamic State: Ex-CIA analyst says airstrike claim is likely 'propaganda'

Islamic State (IS) militants claim that a US female hostage has been killed in a Jordanian air strike in Syria.

IS named the woman as aid worker Kayla Jean Mueller in statements online.

The group provided no other proof for the claim beyond pictures of the alleged site of the air strike, in Raqqa, the group's stronghold in Syria.

Aki Peritz, a former counterterrorism analyst for the CIA, says the claims should be treated with suspicion.

"If I had to guess, they probably killed her some time ago and they're just using this as an excuse," Peritz told the BBC's Laura Trevelyan.