Hunt For ISIS Killer Intensifies After 3rd Public Beheading

British aid worker David Haines apparently killed in new video.
2:31 | 09/15/14

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Transcript for Hunt For ISIS Killer Intensifies After 3rd Public Beheading
Now to the war against Isis. The U.S. Looking for ways to rescue hostages held by the militant group after a third captive was executed over the weekend. Brian Ross is here with the latest. Good morning, Brian. Reporter: Good morning, George. It's a race against time to try to somehow find the remaining hostages. The attorney general said there will be a crackdown on Americans who try to travel to Syria to try to join Isis. Acknowledging the administration hasn't done enough yet to stop the problem. We must be innovative and aggressive in countering violent extremism. We can, and we must do even more. Reporter: This morning, intelligence analysts are poring over this latest video, showing the execution of 44-year-old british aid worker David Haines. The masked man was also the reported executioner of the two American journalists based on voice comparisons. And now of a fellow countryman. This british man has to pay the price. People across this country will have been sickened by the fact that it could have been a british citizen. A british citizen who could have carried out this unspeakable act. Reporter: H araines, the married father two of children was kidnapped a year and half ago. His grieving brother said Haines was the victim of religious extreme extremism. My family and I stand with our arms open to welcome those of any faith. Reporter: This latest execution comes as U.S. Drones are flying over the area. Isis may be trying to hide a new location they have moved to. A the stark desert setting in the new video is different from the previous videos. None of the distinguishing road, rock, and plant backgrounds visible before. The U.S. Is still looking for way to mount a second rescue attempt. He had few specifics on "This week" about the broader U.S. Fl plans in what is called the war against Isis. Is there a limit to U.S. Troops you will send to Iraq? I'm not in a position to tell you limits one way or the other. He said he things the president's plan will be effective against isi sirks ultimately. Will it be soon enough for the two young American being held. Let's go to Amy with the other top stories.

This transcript has been automatically generated and may not be 100% accurate.

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