Islamic State says it has executed British hostage Alan Henning

The Islamic State extremist group on Friday claimed responsibility for the murder of British aid worker Alan Henning.

In the one minute video, titled "Another Message to America and its Allies," Henning introduces himself and says that "because of our parliament's decision to attack the Islamic state, I, as a member of the British public, will now pay the price for that decision."

The British parliament voted to launch airstrikes against the Islamic State in Iraq, but not in Syria, last week.

The video is almost identical to the three released previously, including that of James Foley, who worked for GlobalPost. In this latest video, the masked Islamic State militant also revealed another hostage, identified as American Peter Kassig. Kassig, a former US Army Ranger, had been working as in aid worker helping Syrian refugees when he was abducted.

Thomson Reuters and AFP contributed to this report.