ISIS Murders British Aid Worker David Haines [Report]

ISIS claims it has murdered a British aid worker in similar fashion as two American journalists in a new message aimed directly at the government of the United Kingdom.

Noted Syria-watcher Eliot Higgins and terrorism analyst J.M. Berger confirmed Haines' death, although the U.K. government has not yet responded. According to The UK Telegraph, Haines, 44, was believed to have been kidnapped and later sold to ISIS.

He had been held for nearly two years, but his captivity was a closely-guarded secret until he appeared at the end of a video release which showed the murder of Steven Sotloff, an American freelance journalist.

ISIS released a video of Haines' purported death, apparently at the hands of the same British-speaking militant known as "Jihadi John," and showed another British hostage at the end which would be next, the executioner said, "if you, [David] Cameron, persist in fighting the Islamic State."

The hostage shown at the end of the latest video was identified as British citizen Alan Henning, according to J.M. Berger.