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UN Syria envoy Staffan de Mistura told reporters in Geneva that he had "no information about any UN trucks moving at this stage," and demanded "assurances that the drivers and the convoy will be untouched".

Spokesman for the UN's humanitarian office [OCHA], Jens Laerke, separately confirmed that no UN convoys have deployed across a border or within Syria since the ceasefire call more than 24 hours ago.

According to de Mistura, if the truce holds, aid deliveries "should be taking place very, very soon".

He added that the UN was awaiting authorisation from the Syrian government for aid deliveries to proceed, and that he hoped Syria's people could see "no bombs and more trucks".

Meanwhile, at least two aid convoys reportedly entered Syria via Turkey, despite warnings from Syria's regime against sending aid convoys to Aleppo "without coordination" with Damascus and the UN.

On Tuesday a second convoy of around 20 trucks carrying aid crossed into Syria from the Turkish border town of Cilvegozu, a Reuters witness reported.

Turkey had said prior to the truce that it aims, in coordination with the United Nations, to send delveries of food, children's clothes and toys the besieged northern city of Aleppo.

The UN have not confirmed knowledge of this delivery.

At present, Russian military units are monitoring the ceasfire along a key access road to Aleppo, where some 250,000 civilians are trapped by regime encirclement.

Syria's shaky truce came into effect on Monday, however accusations of ceasefire violations have been levelled by both rebels and pro-government forces. 

No reports of civilian deaths have emerged since the US-Russian brokered cessation of hostilities took force.