U.S. and British forces have carried out airstrike in Syria targeting terrorist "Jihadi John," and reports early Friday morning indicate that strike may have killed him.

"We are assessing the results of tonight's operation and will provide additional information as and where appropriate," Pentagon press Secretary Peter Cook said in a statement late Thursday, confirming the airstrike in Raqqa, Syria, targeting Mohammed Emwazi, known as "Jihadi John."

Emwazi, a British citizen, has been featured in videos showing the grisly murders of U.S. journalists Steven Sotloff and James Foley, U.S. aid worker Abdul-Rahman Kassig, British aid workers David Haines and Alan Henning, Japanese journalist Kenji Goto, "and a number of other hostages," Cook's statement said.

Both CNN and the Washington Post cited officials saying Emwazi was targeted by a drone.

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