Israel’s attack against Hamas in Qatar drew rare public criticism from U.S. President Donald Trump and underscored the risk that the war in Gaza could get worse before it gets better.

Trump’s break with Israeli Prime Minister Benjamin Netanyahu left many questions unanswered Tuesday. Trump said he learned of the attack too late to stop it, giving little time to warn Qatar. Officials there said the U.S. notice came as the bombs were already falling.

European leaders denounced the strike as a setback for Qatari-mediated talks on ending the war and the release of hostages held by Hamas. That group, meanwhile, said its leaders survived the attack, a claim that couldn’t immediately be verified.