The U.S. army personnel maintain its patrolling activities around oil field areas in northern Syria, which is currently under the occupation of the YPG/PKK terror group, local sources said on Monday.

A convoy — including armed vehicles, pick-up trucks and minibuses — were observed patrolling the 40-km (29-mile) line around Qahtaniyyah town and Rumaylan district, located 6-km (3.7 miles) from Turkish border.

According to local sources, the convoy held reconnaissance activities to determine the fresh military checkpoints the U.S. army plans to build near the oil-rich region.

Read more: US keeps patrolling around Syrian oil fields