Pompeo plays down reports of clashes since the ceasefire began around 24 hours ago.
"There was some activity today but we also saw some very positive activity," he says, noting that coordination measures were needed so Syrian Kurdish People's Protection Units (YPG) fighters could withdraw from the Turkish-controlled area.
"We are hopeful in the hours ahead that both the Turks, who were part of the agreement alongside of us, as well as the the YPG fighters in the region will take seriously the commitments that they made," Pompeo adds.
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