The UN has said it is ready to resume aid convoys in Syria after halting operations in response to a deadly attack on an aid mission on Monday.
Trucks will start rolling to some areas but "carefully and cautiously", the UN envoy to Syria Staffan di Mistura told the BBC on Thursday.
Meanwhile, the US has called for all planes to be grounded in key areas of Syria to preserve the truce.
International powers will discuss peace efforts on Thursday in New York.
The International Syrian Contact Group includes both the US and Russia.
There was still hope for an agreement, Mistura added, saying that the US and Russia had "a responsibility".
"They have to rein in, they have to convince their own partners that this is serious. The alternative is chaos, is war. So I'm still optimistic," he added.
Convoys will resume "as soon as possible", according to the UN's Office for the Coordination of Humanitarian Affairs.
Source: MENA
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