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(CNN) - CNN observed hundreds of trucks carrying American personnel gathered near Hasakah, Syria, en route eastward, to the border with Iraq.
A US official confirmed that the land movement, the largest that the United States has done in Syria so far, marks the symbolic end of the largest American presence in the region.
LOOK: Kurds say Turkey is violating the ceasefire in northern Syria
Defense Secretary Mark Esper said the withdrawal would take weeks. Sunday's movement from US positions in Kobani forms a substantial part of the general withdrawal.
Two US officials on the ground told CNN on Saturday that "the ceasefire is not maintained" between Syria and Turkey.
This Thursday, Vice President Mike Pence announced that he and the President of Turkey, Recep Tayyip Erdogan, had agreed to stop Turkey's offensive in northern Syria.
Secretary of State Mike Pompeo referred to the situation in Syria on ABC's "This Week" after the administration decided to withdraw US troops from the region.
LOOK: Bob Menéndez: The 5-day truce to the Kurds is not the solution in Syria
Pompeo said he received a report on Sunday morning from senior leaders indicating that there are "relatively few fighting" in the region. He said the hope is that the ceasefire between the Turkish and Syrian-Kurdish forces will remain.
He added that the administration is still committed to its efforts in the Middle East, including repression against Iran and the fight against ISIS.
The secretary of state also addressed the concerns of many, including Senator Lindsey Graham, that the incursion of Turks and the displacement of Kurds in northern Syria will essentially lead to ethnic cleansing of the Kurdish people.
Pompeo calmed this concern and said the statement that the United States jointly issued with Turkey after this week's negotiations made it clear that there will be no attacks against minorities in the region.
LOOK: Kurdish militias advance in northern Syria while fighting continues
When faced with the observation that the Turks got everything they wanted from the negotiation, Pompeo said "it sure didn't feel that way when we were negotiating."
Nick Paton Walsh of CNN in northern Syria.
Kurdish forces