The United States on Thursday carried out an air strike in Syria targeting the Islamic State militant known as "Jihadi John," who participated in gruesome videos showing the killings of American and British hostages, officials said.
One U.S. official, speaking on condition of anonymity, said the strike likely killed Mohammed Emwazi, a British citizen, but cautioned that it was too soon to make any determination.
The Pentagon said it was still assessing the effectiveness of the strike in the Syrian city of Raqqa, the de facto capital of Islamic State.
If his death is confirmed, it would be an important milestone in the U.S.-led campaign against the group and would come more than a year after U.S. President Barack Obama promised justice after the deaths of American hostages.
Dressed entirely in black, a balaclava covering all but his eyes and the bridge of his nose, "Jihadi John" became a menacing symbol of Islamic State brutality and one of the world's most wanted men.