U.S., Great Britain Still Unsure If 'Jihadi John' Killed in Recent Airstrike

Officials in the U.S. and Great Britain have said they are uncertain a recent airstrike targeting Islamic State terrorist "Jihadi John" was successful in killing the well-known militant.

Great Britain's Prime Minister David Cameron and U.S. Secretary of State John Kerry both said Friday that they are still unsure if an airstrike targeting the militant, known for beheading hostages in Islamic State videos, had been killed.

Mohamed Emwazi was nicknamed "Jihadi John" after he traveled from his home in Great Britain to the Middle East to join the terror group, and began appearing in videos carrying out violent beheadings and threatening western countries.

Despite asserting that he is still unsure of Emwazi's status, Prime Minister Cameron said in a statement that targeting the terrorist in an airstrike was the "right thing to do."

"We have been working, with the United States, literally around the clock to track him down," Cameron said. "This was a combined effort, and the contribution of both our countries was essential. Emwazi is a barbaric murderer."

Kerry added in an address from Tunisia that the Islamic State, also known as Daesh, should see their days as "numbered."

"We are still assessing the results of this strike, but the terrorists associated with Daesh need to know this: Your days are numbered, and you will be defeated," Kerry said. "There is no future, no path forward for Daesh, which does not lead ultimately to its elimination, to its destruction."

An unidentified U.S. military official told ABC News that there is a "high degree of certainty" that Jihadi John was killed in the recent airstrike, which reportedly targeted a vehicle the terrorist was traveling in in Raqqa.

The official added that the drone made a "direct hit" on Emwazi's vehicle.