Transcript for ISIS' New Executioner May Be Known to Authorities
The White House tonight it's responding now to escalating tensions over seas between two powerful Muslim nations in the Middle East. Saudi Arabia cutting ties with Iran protesters attacking the Saudi embassy and Iran. Burning the Saudi flag after Saudi Arabia executed a prominent Shiite cleric. Backed by the Iranians. The US concern this new conflict will only complicate the efforts against ice is even more. Meantime there is a major development tonight in the fight against places he remembered the killer known as Joseph Hodding John the mask the British accent. Over the weekend a new license video showing a man authorities call the new Jihad. And tonight they think they might know who he is ABC news has learned one of the men they're looking at we've sat down would before. Here's ABC's chief investigative correspondent Brian Ross tonight. This is the new prices version of evil personified. His face hidden by a black mask speaking with a British accent. We will continue to weigh in you had. Brig wardens. And one day invade north. Tonight US and British officials are comparing the voice and physical characteristics. To this well known British medical so dark the dar who fled London to Syria a year and a half ago. After being arrested on charges of supporting terrorism. Shortly before that he talked with ABC news. Lost I'll never come. Until a group of Winston's rise and hope for the lights up. Dart was interviewed by correspondent llama Hasan and 2014. As he urged young Muslim men and Lunden to push for Sharia law. I think I'll be the beginning of the end of the United States of America. Pulpits and of Europe and the million since I was. And tonight British officials say he is a leading suspect is new ice is executioner. Which if it is the case we'll put him on the same list that led to the door attack against the previous license face of evil. The so called Jihad and John who executed for American hostages Brian Ross on these new developments.
This transcript has been automatically generated and may not be 100% accurate.