The video showing what the fifth beheading victim of the Islamic State militant known as Jihadi John was released just hours after reports emerged that he was injured in an allied air strike.

Islamic State militants have beheaded another American hostage, Peter Kassig, issuing a video claiming the killing yesterday and warning the US they would kill other US citizens "on your streets."

US aid worker Peter Kassig has been beheaded by the Islamic State group, it has been confirmed.

A new video by the militant Islamic State group claims that US aid worker Peter Kassig has been beheaded.

The parents of a US aid worker threatened with beheading by the Islamic State group say they have broken their silence about their son’s year-long captivity because "the dynamics have changed" and they fear for his life.

The parents of a US aid worker held captive by the Islamic State group have revealed he told them in a letter he was afraid to die, but that he had converted to Islam voluntarily and was at peace with his beliefs.

A video apparently showing the beheading of British hostage Alan Henning has been released on the internet.