So, will the chemical weapons watchdog be able to carry out its investigations inside the rebel-controlled Douma? CGTN's Alaa Ebrahim reports from Damascus.

ALAA EBRAHIM DAMASCUS "Sources in the Syrian ministry of foreign affairs tell CGTN that O-P-C-W investigators are expected to arrive in Syria within the next two days. The international chemical weapons watchdog experts will be looking into reports of an alleged chemical weapons attack on the rebel-held town of Douma last weekend. Rebels accused the Syrian government of carrying out the attack using Sarin gas that killed scores, but the government denies the allegations.

It's still unclear how the international experts will be able to operate inside Douma as rebels still control the town. On Sunday, rebels agreed to resume a Russian-brokered deal with the Syrian government. It allows for the evacuation of rebels out of Douma to the town of Jarablus near the border with Turkey as well as releasing prisoners that rebels have captured over the past six years.

The deal is advancing slowly for two reasons: First, out of an estimated 32-hundred prisoners, only about 200 have been released amid reports the rest are no longer alive. Secondly, many believe the rebels are waiting for a possible U.S. military strikes in retaliation for the alleged chemical attack. Action like that could help the rebels bounce back against government forces. Alaa Ebrahim - CGTN - Damascus."