Twenty-two American service members were injured in a helicopter accident in northeastern Syria on Sunday, according to U.S. Central Command.
On Monday evening, the command said in a statement that troops had suffered “varying degrees of injuries” and were receiving medical treatment. Ten people were evacuated to an advanced care facility outside the area.
An unknown number of troops arrived at Landstuhl Regional Medical Center in Germany on Tuesday, hospital spokeswoman Marcy Sanchez said.
Sanchez said their conditions had not been determined.
According to the command, no enemy fire was reported and the cause of the incident is under investigation.
According to the command, the United States has about 900 troops in Syria as part of a joint effort with Kurdish fighters to prevent a resurgence of the Islamic State.
Lt. Col. Dave Eastburn, a spokesman for U.S. Central Command, said in March that the United States also has about 170 contractors in Syria.
In March, a drone attack on a U.S. base by groups linked to Iran’s Revolutionary Guards killed one contractor and wounded at least 23 soldiers. The United States has carried out airstrikes on facilities used by these groups.
U.S. forces have been in the region since the Islamic State group swept across Iraq and Syria in 2014, controlling large swaths of territory.