Israel struck the headquarters of Hamas' political leadership in Qatar on Tuesday as the group's top figures gathered to consider a U.S. proposal for a ceasefire in the Gaza Strip. The strike on the territory of a U.S. ally marked a stunning escalation and risked upending talks aimed at winding down the war and freeing hostages.

The attack angered Qatar, an energy-rich Gulf nation hosting thousands of American troops that has served as a key mediator between Israel and Hamas throughout the 23-month-old war and even before. It condemned what it referred to as a “flagrant violation of all international laws and norms" as smoke rose over its capital, Doha. Advertisement

The United States said Israel alerted it before the strike. But American officials sought to distance the U.S. from the a

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