Buildings which were damaged during the security operations and clashes between Turkish security forces and Kurdish militants, are pictured in Sur district of Diyarbakir, Turkey February 11, 2016.
“We have urged Syrian Kurdish and other forces affiliated with the YPG not to take advantage of a confused situation by seizing new territory,” Kirby said in a statement.
A Kurdish official said the Menagh base which was hit had been captured by the Kurdish-allied Jaysh al-Thuwwar group rather than the YPG.
The shelling took place after Kurdish YPG fighters backed by Russian bombing raids drove Syrian rebels from a former military air base, south of the town of Azaz and near the Turkish border.
“The YPG will immediately withdraw from Azaz and the surrounding area and will not go close to it again.”