Washington (CNN) The US Department of Defense over the weekend identified two US service members killed in non-combat related incidents in Iraq and Qatar.

Army Spc. Ryan Dennis Orin Riley, 22, of Richmond, Kentucky, died Saturday in Ninawa Province in Iraq.

Army Spc. Ryan Dennis Orin Riley

Riley was supporting the effort against ISIS as part of Operation Inherent Resolve, according to a department statement. Officials identified Riley on Sunday and did not disclose further details about the incident, which is under investigation.

Riley was assigned to 2nd Battalion, 32nd Field Artillery Regiment, 1st Brigade Combat Team, 101st Airborne Division at Fort Campbell, Kentucky, according to the Defense Department.

On Saturday, the department identified an airman killed as part of Operation Freedom Sentinel, the global coalition effort against al Qaeda.

Read More