Twenty-two US service members were injured in a helicopter "mishap" in northeast Syria, the US Central Command said late on Monday.
Ten service members had been evacuated to higher care facilities outside the Central Command area of responsibility, it said in a statement.
The cause of the incident on Sunday was under investigation, although no enemy fire was reported, said the US Central Command, which oversees US forces in the Middle East.
More to follow.

Trump adds seven countries to full travel ban list
Family of alleged Bondi gunman unaware of 'radical mindset', say Indian police
Trump orders 'blockade' of sanctioned oil tankers leaving, entering Venezuela
Israeli forces kill Palestinian teen in West Bank, health ministry says
Trump sues BBC for defamation, seeks up to $10 billion in damages
