The Latest: UN Syria envoy: ‘we have a problem’ with aid

FILE — This Thursday Sept. 1, 2016 file photo, provided by the Syria Press Center (SPC), an anti-government media group, shows civilians leaving the town of Suran, in Hama province, Syria. Five years of failed efforts to quell the fighting in Syria have persuaded many observers that the war, inconclusive and catastrophic on a historic scale, may be unresolvable. But a closer look at the landscape allows a glimmer of hope that a turning point may have been reached with the truce that took effect Monday, Sept. 12, 2016. (Syria Press Center via AP, File)

BEIRUT (AP) — The Latest on developments in Syria, where a cease-fire brokered by the U.S. and Russia has come into effect (all times local):

1:20 p.m.

The U.N. Syria envoy Staffan de Mistura says “we have a problem” on getting humanitarian aid into Syria, despite the U.S.-Russia brokered deal.

De Mistura says Thursday the Syrian government has not provided needed “facilitation letters” to allow for the start of U.N.-led aid convoys expected under the new cease-fire agreement.

He says 40 aid trucks are ready to move and his priority is getting aid into the embattled, rebel-held neighborhoods of the northern Syrian city of Aleppo.

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1:00 p.m.

Activists say Syria’s cease-fire is still holding despite some violations but aid has not yet reached besieged rebel-held neighborhoods of the northern city of Aleppo.

The Britain-based Syrian Observatory for Human Rights says government forces and opposition fighters are now ready to withdraw from the Castello road, a main artery into Aleppo, to hand it over to Russian troops.

It says Thursday that government forces will not start pulling out until the rebels begin to do the same.

The cease-fire that went into effect Monday is part of a U.S.-Russia agreement that also calls for allowing humanitarian aid to reach besieged areas in Aleppo.

The U.N says some 20 trucks carrying U.N aid and destined for rebel-held Aleppo remained in the customs area on the border with Turkey on Wednesday.