Islamic State militants have reportedly released a video showing the beheading of another UK hostage Alan Henning who was kidnapped in December last year.
Henning was a Salford taxi driver who delivered aid to Syria in December when he was later held hostage by IS fighters.
IS militant group had earlier threatened to kill Henning in a footage released last month showing the beheading of Briton David Haines.
In the latest video, they threatened to kill a U.S. aid worker Peter Kassing, reported the BBC.
British Prime Minister David Cameron said that the country would do anything to hunt the murderers and do justice.
