Islamic terror group ISIS says they have executed a second American journalist, and warn President Obama that they will not stop as long as U.S. missiles "continue to strike our people."
The White House has verified the authenticity of the video, the National Security Council said Wednesday, one day after the video was released.
"The U.S. Intelligence Community has analyzed the recently released video showing U.S. citizen Steven Sotloff and has reached the judgment that it is authentic," a spokesperson with the National Security Council said.
The masked executioner seen in the video "A Second Message to America," spoke directly to the president.
"I'm back, Obama, and I'm back because of your arrogant foreign policy towards the Islamic State...despite our serious warnings.
"Just as your missiles continue to strike our people, our knife will continue to strike the necks of your people."
Sotloff disappeared while reporting Syria in August 2013. Last month--one year after Sotloff's disappearance--ISIS released a video showing journalist James Foley being beheaded. At the end of the video, a second hostage was brought out. The hostage was identified as Sotloff. He was named the next to die if the U.S. did not stop their missile strikes.
Sotloff's mother made an impassioned plea through video to ISIS leader Abu Bakr al-Baghdadi, begging him to spare her son's life. But one week later, ISIS carried through with their threat to kill her son.
Like Foley, the man seen in the video released Tuesday is clad in an orange jumpsuit. Sotloff spoke to the camera, stating that he was "paying the price" for U.S. intervention. Then he was beheaded.
After the execution, a third captive, David Haines of Britain, was threatened.
Obama condemned the video Wednesday, calling it repulsive, horrific and vowing that justice would be served. The president was visiting Estonia when the video was released, and spoke during a joint news conference with Estonia's president.
Obama warned ISIS that the deaths of Foley and Sotloff would only unite Americans, and that the country's "reach is long." He said the America would not be intimidated by the group's threats.
A family spokesman said in a brief statement that the family is "grieving privately."
The State Department said Tuesday that it is believed ISIS still has a "few" Americans captive.