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Three leaders of ISIS have been killed by American airstrikes in Iraq in the past month and a half, U.S. defense officials said Thursday.

They were identified as Haji Mutazz, a deputy to the ISIS leader; Abd al-Basit, the top military commander; and Radwin Talib, who is in control of ISIS in Iraq. They were described as mid- to high-level leaders.

One official called the deaths of Mutazz and al-Basit in particular a “serious blow to ISIS command and control.” The official said that the setback may be temporary because ISIS has plenty of willing replacements.

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— Jim Miklaszewski