The U.S. military announced late Saturday the deaths of two prisoners in Iraq by cardiac arrest, one of whom had been wounded earlier this month in a mortar attack on a prison.

One of the men died Thursday “of cardiac arrest during a routine medical transfer from Camp Cropper to Camp Bucca,” a U.S. military statement read.

“The detainee was pronounced dead at 9:07 p.m. by an attending physician at Camp Bucca’s medical facility. An investigation is pending to determine the cause of death, a standard procedure for detainees who die while in custody.”

The second prisoner died on Friday also after suffering a heart attack apparently related to wounds sustained in a June 9 mortar attack on Camp Bucca.

The man had been being treated at the Camp Bucca prison hospital since suffering shrapnel wounds to the abdomen in the attack, officials said.

At least seven other prisoners were killed in the attack, which wounded 68 other prisoners and one Iraqi guard. No Americans were hurt in the incident.

In both cases, family members of the prisoners will be given the remains after an investigation and autopsy are performed, officials said.

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