Islamic State issues video of beheading of US journalist
In 2013, the US journalist was abducted in Syria.
In the video, the masked ISIS figure in the new video said: "Just as your missiles continue to strike our people, our knife will continue to strike the necks of your people."
The militant also threatens to kill a British hostage next.
"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," CNN reported.
"The family knows of the video and is grieving privately," family spokesman Barak Barfi was quoted as saying by CNN.
British Prime Minister David Cameron tweeted: " If verified, this is a despicable and barbaric murder. My thoughts are with Steven Sotloff's family. Security officials are briefing me now. "
Earlier, another US journalist James Foley was beheaded by militants.
The militant group video taped the beheading of the journalist and then published it on the Internet.
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