A U.S. service member died in Syria on Tuesday in what appears to be a non-combat incident, officials have announced.

The service member’s identity is being withheld pending next of kin notification, according to a news release from the U.S. military-led coalition in Iraq and Syria.

“Initial reports indicate the incident was not due to enemy contact,” the news release says. “The incident is under investigation.”

A total of 10 U.S. troops have died supporting Operation Inherent Resolve so far this year, according to the Defense Manpower Data Center.

Additionally, 110 U.S. service members were diagnosed with mild-Traumatic Brain Injury after Iran launched ballistic missiles at Al-Asad Air Base in January in response to a U.S. airstrike that killed Iranian Maj. Gen. Qasem Soleimani, former head of the Islamic Revolutionary Guard Corps.

Eventually, 29 soldiers who received mild-TBI as a result of the attack were awarded Purple Hearts.

Related: Here’s what it was like when Iran launched ballistic missiles at US troops in Iraq, according to those who were there