British aid worker David Haines has been executed by ISIS militants, according to a video posted Saturday to a website associated with the group, making him the third Western captive to be killed by the Islamist extremist group in recent weeks. The ISIS video post showing Haines' beheading called his execution "a message to the allies of America." It is produced very similarly to the videos that showed the executions of American journalists James Foley and Steven Sotloff, the last of which included Haines and the threat that he'd be killed next. The new video pictures a masked ISIS militant placing his hand on another captive, whom he identified as Alan Henning, a British citizen.Brother: Haines is survived by his wife, 2 children; he once was in the UK air forceDavid Haines found his true calling in humanitarian work, his brother saysThe video characterizes Haines' beheading "a message to the allies of America"British PM: "We will do everything in our power to hunt down these murderers"
_ officials said after the video's release that they had sent troops to try to rescue an unidentified British citizen "some time ago," but failed.