Now to Syria, where a probe into an alleged chemical weapons attack in Douma has been delayed yet again. An international team of chemical weapons experts still hasn't been able to visit the site of the attack. Our correspondent Alaa Ebrahim has more from Damascus.

ALAA EBRAHIM DAMASCUS "The challenge of beginning an OPCW inquiry into the possible use of chemical weapons in Syria continued for another day, as the team spent a fifth day in the Syrian capital - a full eleven days since the alleged attack took place.

A statement from the international chemical weapons watchdog said the inspectors had been delayed in their attempts to start work in Douma yet again - this time by two separate incidents involving a UN security advance team. The first: when a large crowd gathered at one site where the team attempted to work, prompting the UN team to withdraw. Then, the OPCW says, the UN team came under "small arms fire and an explosive was detonated" at a second site.

The chemical inspectors were expected to start their work in earnest on Wednesday, collecting soil samples at sites the rebels say were hit with chemical agents. But the incidents with the security team makes it unclear when the inquiry will proceed.

Rebels accuse the Syrian government of carrying out the attack that killed dozens while the government denies any involvement - and Russia has accused the West of staging the event.

The Syrian government has repeatedly vowed to provide the inquiry with all the needed access since the OPCW is in Damascus at the invitation of the government. But the situation in the sites of the attack in Douma town is very complicated as the suspected attack sites are under control of the Russian military police. Syrian police are deployed throughout the town but the Syrian army hasn't entered the town, under terms of an evacuation deal with the rebels.

Rebel fighters with small arms remain in Douma and a local community leader says there are still hundreds of them, with many still vowing to fight the government when the wind shifts in their favor. And though it is unclear who carried out the attack on the UN team, one thing remains certain and that is the inquiry is off to a rocky start and an uncertain outcome. Alaa Ebrahim, CGTN, Damascus."