"The 20 trucks... have passed over the Turkish border, they are in the buffer zone between the Turkish and Syrian border," the head of the United Nations humanitarian taskforce for Syria, Jan Egeland, told reporters.
"They've been waiting and sleeping at the border now for 48 hours. So they could go on a minute's notice," he added.
The aid in the trucks, mainly flour and food, is expected to be delivered to eastern Aleppo.
A key part of the cease-fire agreement, which was brokered by the United States and Russia was the opening of channels for humanitarian access. However, within hours of the ceasefire coming into effect, disagreements over aid began.
The trucks were stalled at the border after Damascus stated it would not allow any aid to come from Turkey, which it accuses of arming Islamist groups in the country.
“We could go today. We're not. . . . The permits have not been given," Egeland told Washington Post reporters in Geneva.
The Syrian Army has begun to withdraw from Castello Road in Aleppo, according to Xinhua News, in order to allow the delivery of humanitarian aid to rebel-held neighbourhoods of the city under the ceasefire between government and opposition forces.
Although heavy military units have begun to leave, a small number of soldiers stayed behind, standing by the Syrian army's positions until they have been completely passed on to Russian forces.
Their withdrawal is expected to continue while UN-backed humanitarian convoys are anticipated to enter the city on Friday by way of Castello Road.
With military personal withdrawing and officials wrangling over logistics citizens took to the streets in protest of the five year civil war.
"I think both sides, the opposition and regime, are tired of this war and want to have a break,” Abu Yaman, a father of four in Damascus, told the New York Times.
According to Modar Shekho, a nurse in Aleppo who filmed demonstrations in her city, they are lacking the basic necessities for day-to-day living.
“Here this demonstration is against the [international] aid from Castello Road,” Sherkho explained. According to her, the demonstrators say they do not need the aid being provided. What they want is oil, medical supplies, and for the road out of Aleppo to be opened.
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