British Prime Minister David Cameron said Friday it was not yet clear whether the Islamic State group militant known as “Jihadi John” had been killed in a US air strike in Syria.

Cameron said the strike had targeted British citizen Mohammed Emwazi but added: “We cannot yet be certain if the strike was successful” in a statement delivered outside his Downing Street office.

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He added: “This was an act of self-defence, it was the right thing to do.”

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The Pentagon announced Thursday that an air strike targeting Emwazi, a computer programmer who grew up in London, took place in Raqa, IS’s de facto Syrian capital.

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Emwazi featured in videos showing the murders of US journalists Steven Sotloff and James Foley, US aid worker Abdul-Rahman Kassig, British aid workers David Haines and Alan Henning, Japanese journalist Kenji Goto and other hostages.