A member of a new Syrian force trained by the U.S. military was believed to have been killed in clashes last week with al-Qaida's Syria wing, in what would be the fledgling force's first battlefield casualty, U.S. officials told Reuters on Monday.
The U.S. officials, who spoke on condition of anonymity to discuss the incident, said the Syrian rebel was killed during fighting on Friday with suspected members of Nusra Front.
The Pentagon declined comment, citing "operational security reasons."