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(CNN) - A video that shows the beheading of American Steven Sotloff was delivered as a "second message to America" to halt airstrikes in Iraq, following through on a threat to kill the journalist.
In the video posted Tuesday online, Sotloff says - in a message surely scripted by his captors - that he is "paying the price" for U.S. military intervention.
The intelligence community in the United States is working to confirm the authenticity of the video, and the journalist's family was waiting for that formal authentication that Sotloff has been killed.
"The family knows of the video and is grieving privately," family spokesman Barak Barfi said.