People walk near the Manbij Municipality building in Manbij city, Syria December 29, 2018. REUTERS/Rodi Said

ANKARA (Reuters) - Work between Turkey and the United States to implement an agreement over the Syrian town of Manbij is proceeding more slowly than desired, Turkish military sources said.

Turkey is making efforts to speed up the process, the sources said, referring to an agreement between the NATO allies to a complete withdrawal of the Kurdish YPG militia from the town. Ankara considers the YPG a terrorist organization.

Turkey and Russia have conducted three coordinated patrols in the mainly Kurdish-controlled northern Syrian region of Tel Rifaat and plan to continue the patrols, the sources said.