Obama: ISIS killers will not intimidate U.S.

Analysis of the ISIS beheading videos

STORY HIGHLIGHTS

• NEW: "Our reach is long and ... justice will be served," Obama says
• The Islamic militant group released the video Tuesday
• It shows the second beheading of an American journalist in two weeks
• James Foley was beheaded in almost "same choreography" as Sotloff, professor says

(CNN) -- President Barack Obama said Wednesday that the killers of two American journalists will be brought to justice, and their barbaric acts will do nothing to intimidate the United States.

Terror group ISIS released a video Tuesday showing the apparent beheading of journalist Steven Sotloff. A day later, U.S. officials said the video is authentic.

The killing is the second beheading of an American journalist in two weeks, and the militant group said it's a result of Obama's decision to conduct airstrikes against it in Iraq.

In the video, Sotloff kneels in the desert, dressed in an orange prison-style jumpsuit. A masked "executioner" lords over him, wielding a knife.

The journalist speaks; the executioner speaks. Then the victim is beheaded. The video is similar to one released two weeks ago showing the death of another American journalist, James Foley.