Convoys of trucks with armoured personnel carriers, tanks, concrete blocks, bulldozers and diggers were seen heading to the Turkish border town of Akcakale on Tuesday.
Turkey advances in northeast Syria after United States withdrawn troops from the Turkey-Syria frontier in an abrupt policy shift.
U.S. forces evacuated two observation posts at Tel Abyad and Ras al Ain on Monday.
Meanwhile President Trump defended his move, saying the Kurds had not been abandoned and termed them as “special”.
Meanwhile, a large crowd of protesters gathered in the northern Syrian town of Tal Abyad to demonstrate against Turkey’s planned offensive.