Ankara protested the unusual Friday incident and asked for the immediate release of the Turkish soldiers.
"Such an act coming from a 50-year-old ally has shocked and deeply hurt us," said deputy Chief of General Staff, Gen. Yasar Buyukanit.
The reason for the raid was said to be an allegation that the Turks were preparing an assassination against a Kurdish governor in Iraq.
Some 100 U.S. soldiers entered the building used by Turkey as a base for its special unit that is kept on watch for any subversive activities of Kurdish terrorists, a major Turkish preoccupation along the border.
Notable deaths of 2014 [PHOTOS]