WASHINGTON -- A Pentagon spokesman says the two U.S. soldiers killed Sunday in Iraq were casualties of a U.S. artillery "mishap.

The soldiers have been identified as 22-year-old Sgt. Allen L. Stigler Jr. of Arlington, Texas, and 30-year-old Sgt. Roshain E. Brooks of Brooklyn, New York.

Both were cannon crew members assigned to 2nd Battalion, 319th Airborne Field Artillery Regiment, 2nd Brigade Combat Team, 82nd Airborne Division.

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The Pentagon spokesman, Army Col. Rob Manning, says an Army artillery unit was firing on an Islamic State of Iraq and Syria, or ISIS, mortar position "when a mishap occurred." Manning says there is no indication that ISIS played a role in the deaths. He says he cannot provide other details because the incident is under investigation.

Five others suffered injuries that Manning says are not life-threatening.