A group that monitors jihadists and white supremacists says ISIS has released a video that purports to show the execution of American hostage Steven Sotloff.

CNN has details from the video:  

Sotloff speaks to the camera before he is killed, saying he is "paying the price" for U.S. intervention.

The masked ISIS figure in the video speaks to U.S. President Barack Obama, telling him, "Just as your missiles continue to strike our people, our knife will continue to strike the necks of your people."

Sotloff was a freelance journalist who had reported for outlets including Time and the Christian Science Monitor. ISIS threatened to kill him in the video they released depicting the execution of hostage James Foley, also a journalist.