(CNN) — Israel carried out an attack targeting Hamas leadership in Qatar on Tuesday, in an unprecedented strike on a key mediator in the Gaza conflict that threatened to derail renewed peace efforts and further inflame tensions in the region.

A senior Israeli official told CNN that among those targeted was Hamas’ chief negotiator Khalil Al-Hayya .

CNN’s Kareem Khadder, Jeremy Diamond, Sarah El Sirgany, Abbas Al Lawati and Catherine Nicholls contributed to this report.

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