The Pentagon says it has raised its concerns with Turkey after a Turkish news agency published a map of U.S. military posts in northern Syria.
The state-run Anadolu News Agency printed the map Wednesday, showing 10 U.S. locations in a portion of Syria under Syrian-Kurdish control.
Turkey says the Kurdish People's Protection Unit is the armed branch of the Kurdish Democratic Party, which Turkey considers to be a terrorist group.
A Pentagon spokesman said U.S. military officials cannot identify the source of the map, but "would be very concerned if officials from a NATO ally would purposefully endanger our forces by releasing sensitive information."
The Pentagon would not confirm if the information on the map is accurate.