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The war that Donald Trump started with Iran continues to spiral. After a ceasefire fell apart earlier this month, several U.S. service members were killed over the weekend—the first American fatalities in months—as Iranians continue to die in large numbers. Prospects for peace remain dim and the war is instead spreading, with violence spilling into the rest of the region.

How were the U.S. troops killed?

Two died after an Iranian ballistic missile reportedly struck their housing unit at a U.S. military base in Jordan. On Monday, the Pentagon identified them as 1st Lt. Tyler James Feehan of Hawaii and Pvt. Isabella Gonzales of Texas. Feehan was 25; Gonzales was 19. A third U.S. service member in Jordan is missing and presumed dead, and a fourth was killed during the detonation of a downed Iranian drone in Iraq on Saturday. The war’s total U.S. death toll is now at least 17. Earlier Iranian attacks also injured hundreds of U.S. service members, some seriously—casualties the Pentagon has been slow to disclose.

Are Iranian civilians dying?

Independent estimates suggest at least 1,700 have been killed since the war began. And that count is likely to climb: Sunday night marked the ninth straight day of attacks on Iran,........

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