"The reconnaissance team returned to Damascus".
According to the United Nations report, a security team travelled to two sites on Tuesday escorted by Russian military police.
Jarablus is shared between Turkish and Syrian opposition control.
About 1,500 fighters and 3,500 of their family members left Dumayr on Thursday, choosing to relocate to north Syria than accept an amnesty offered by the government.
'There has been a ban for 100 years.there is a big difference between seeking to change a regime which was the objective to the Iraq war and what we are dong here which is protecting the worldwide order and protecting that ban on chemical weapons which are so egregious.
"UNDSS in Damascus is now engaged in further discussions and coordination with representatives of the Syrian Arab Republic and the Russian military police on how to enhance and reinforce security arrangements in specific locations in Douma", it said.
But even a sophisticated air defense system would have had trouble defending against the type of attack conducted by the USA -led coalition, analysts say.
Several residents said that the doctors initially had been treated well, even being offered a meal with a Syrian security official before they were told to deny the attack on camera.
Syria: Assad regime still has 'residual' chemical capability, says Pentagon
The odor, respiratory tract symptoms and the fact it took some time before the victims died backed such a conclusion, Inoue said.
Dreid said it was not clear why the deal appeared to have fallen through.
The American assessment underscored the difficulty in getting additional or more conclusive evidence about the Syrians' suspected use of chemical weapons and verifying the allies' success in destroying any large caches of chlorine gas or sarin.
Officials have stated that evidence pointing towards the use of chemical weapons may have been tempered with. Rebels who once held the town abandoned it this month.
Speaking last weekend, Prime Minister Theresa May said there was "no practicable alternative" than to use force to deter the use of chemical weapons by the Syrian regime.
Moscow had warned the U.S. before the strike that it could hit back if the U.S. actions jeopardise Russian servicemen in Syria, and the allies gave Russia an advance warning to make sure no Russians were in the line of fire.
The UN Security Council held a meeting on Tuesday at Russia's request in order to discuss the situation in Syria, which is dedicated to the humanitarian situation in Raqqa, as well as the Al-Rukban refugee camp on the border with Jordan. Iraq has carried out airstrikes in Syria against the group in the past. Syria intercepted 71 out of over 103 cruise missiles and air-surface missiles launched at civilian and military targets, the MoD said, adding that Russian air defense units stationed in Syria were not involved in repelling the attack. When regimes like the ones running Syria, Iran and North Korea make promises, they may not intend to keep them - but they should understand that there will be consequences if they don't.More news: Andrew McCabe to sue Trump admin for defamation, wrongful termination