This week, two convoys were scheduled to reach opposition-held Waer near the central city of Homs, but one was forced to turn back due to sniper fire en route on Sunday.
The following day, shelling and gunfire prevented trucks from reaching the town, but on the way back to a warehouse, gunmen diverted the convoy to a "government-controlled area," O'Brien told the Security Council.
"The drivers and trucks were temporarily detained, and some drivers were reportedly roughed up, but have since been released, without humanitarian supplies, and everyone is safe and accounted for," O'Brien said.
The United Nations last week had urged the Syrian government to allow the aid to reach Waer as a "goodwill gesture" ahead of peace talks opening on Thursday in Geneva.
O'Brien condemned the incident as a "blatant disregard for the protection of humanitarian workers" and said efforts would continue to try to reach Waer, where 50,000 civilians have not received any assistance in nearly four months.
In the besieged towns of Madaya and Kefraya, five people have died in recent days, among them a mother who died giving birth, O'Brien said.
Rebel-held Madaya and government-controlled Kefraya are covered by a complicated arrangement to provide tit-for-tat aid, but the deal has gone awry.
The war in Syria, which will enter its seventh year next month, has killed 310,000 people while more than half of the country's population -- or nearly 13 million people -- have been driven from their homes.
UN envoy Staffan De Mistura said he is not expecting a breakthrough in the peace talks, the first between the Syrian government and the weakened opposition since April last year.
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The following day, shelling and gunfire prevented trucks from reaching the town, but on the way back to a warehouse, gunmen diverted the convoy to a "government-controlled area," O'Brien told the Security Council.
"The drivers and trucks were temporarily detained, and some drivers were reportedly roughed up, but have since been released, without humanitarian supplies, and everyone is safe and accounted for," O'Brien said.
The United Nations last week had urged the Syrian government to allow the aid to reach Waer as a "goodwill gesture" ahead of peace talks opening on Thursday in Geneva.
O'Brien condemned the incident as a "blatant disregard for the protection of humanitarian workers" and said efforts would continue to try to reach Waer, where 50,000 civilians have not received any assistance in nearly four months.
In the besieged towns of Madaya and Kefraya, five people have died in recent days, among them a mother who died giving birth, O'Brien said.
Rebel-held Madaya and government-controlled Kefraya are covered by a complicated arrangement to provide tit-for-tat aid, but the deal has gone awry.
The war in Syria, which will enter its seventh year next month, has killed 310,000 people while more than half of the country's population -- or nearly 13 million people -- have been driven from their homes.
UN envoy Staffan De Mistura said he is not expecting a breakthrough in the peace talks, the first between the Syrian government and the weakened opposition since April last year.
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