It appears that Islamic State militants have executed another Westerner and posted the video of his beheading on Twitter, CNN reports.
British aid worker David Haines would be the third Westerner killed by the extremist group ISIS in a similar video in recent weeks.
Haines, 44, was in Syria working at a refugee camp when he was abducted in March of 2013.
Two weeks ago, Haines had appeared in an ISIS video that showed the execution American journalist Steven Sotloff, the Washington Post reported.
Sotloff's execution came only weeks after a video showed the execution of American journalist James Foley.
This newest video shows another captive being threatened, a man identified by a masked militant as British citizen Alan Henning.
Haines' masked executioner sounds like the man who killed Foley and Sotloff, CNN reports.
[Via CNN]
