It's being called one of the deadliest days of the Syrian campaign in Eastern Ghouta, as at least 80 people have been killed by government air strikes. Rebels say they've treated dozens of people for exposure to chlorine gas. Alaa Ebrahim has the details.  

ALAA EBRAHIM DAMASCUS Medics in the town of Hammoria in Syria's Ghouta region say they've been treating people suffering from symptoms consistent with exposure to chlorine gas. Syrian government sources denied allegations that Damascus had carried out the attack, dismissing the accusation as an act of desperation by Western powers.

Just last week, Syria's Permanent Representative to the UN said Damascus had intelligence concerning terrorist plans to launch a chlorine gas attack, and then blame the Syrian Army for using it. Since the government launched its campaign to retake Eastern Ghouta, rebels have accused the government of carrying out chemical attacks. CGTN cannot independently verify any of these reports.

Pro-government media have also broadcast several videos from the town Hammoria - the site of the alleged chlorine attack - saying they show pro-government activists hoisting the Syrian flag in the town's square. Another video shows people in a shelter, appealing to the military to rid them of insurgents.

The Syrian Air Force stepped up its operations-hours after a UN aid convoy arrived in Douma-the largest city in the rebel-held enclave of Eastern Ghouta. This was the first convoy to reach the embattled region after a UN Security Council resolution, declaring a ceasefire and the immediate delivery of aid. But the World Health Organization office in Syria office said in a tweet that the government had stripped the convoy of supplies-specifically, of surgical and trauma kits. Alaa Ebrahim, CGTN, Damascus.