JERUSALEM — Israel attempted to kill senior members of Hamas in an airstrike Tuesday in Qatar, a sharp escalation that brought the Mideast war to a close U.S. ally and a primary mediator in trying to end the conflict in the Gaza Strip.

The Israeli strike on a Hamas meeting, where the group said its officials were discussing a ceasefire proposal backed by President Donald Trump, threatened to undermine negotiations over the war in Gaza. The direct attack on Qatar’s territory also risked antagonizing the Qatari government and destabilizing its diplomatic efforts in the war.

The afternoon attack by Israel’s air force hit the capital, Doha.

Hamas said the Israeli strike had failed to kill senior officials in the group, without specifying whether they had sustained injuries. In a statement,

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