Syrian regime forces today cut off the largest town in Eastern Ghouta from the rest of the opposition enclave in a blow to beleaguered rebels defending their last bastion near Damascus.
Government troops and allied militia have recaptured half of the besieged region in a blistering assault launched on February 18 that has left nearly 1,000 civilians dead and prompted global outcry.
They have pursued a divide-and-conquer strategy, eating away at rebel-held towns and successfully isolating Ghouta's main town of Douma today.
Rescue workers and medics were struggling to navigate the town's rubble-littered roads to bring wounded residents back to field clinics.
Douma's opposition-run local council issued an urgent "distress call" today to international organisations.
"The bomb shelters and basements are full, and people are sleeping in the streets and in public gardens," the statement said.
"For three days, it has been hard to bury the dead because of the intense bombing on the cemetery," it added.
Rebels in recent days tried to slow the advance with an attempted counter-offensive, but President Bashar al-Assad's forces steamrolled their efforts.
Syrian state television on Saturday reported the army had "intensified its operations... and was advancing in three main zones."
It broadcast live footage from a neighbourhood in Misraba recently recaptured from the army.
Dozens of civilians including women and toddlers could be seen in a dark basement, surrounded by troops.
One elderly man broke down into tears as he told state television that his family had fled to Douma under fierce bombardment.
The offensive has killed more than 975 civilians, including more than 200 children, and wounded several thousand people, according to the Observatory, which relies on a network of sources on the ground.
It was the second convoy in one week, after deliveries on Monday were interrupted by heavy bombardment.
"I've never seen such scared faces in my life," Sajjad Malik said.
He described seeing a five-storey building that had been reduced to rubble, with a powerful stench emanating from several bodies trapped underneath.
In addition to clashes around Douma, fighting on Saturday raged to the west near the town of Medeira and further south near Hammuriyeh, Saqba, and Efteris.
Yesterday, 13 HTS members and their family members were bussed out of the enclave. Rebels said they would be taken to the HTS-controlled northern province of Idlib, in an arrangement struck following consultations with the UN and international players.
Such evacuation deals have been repeatedly agreed in Syria's seven-year war, most notably in the second city of Aleppo in late 2016.
After a ferocious month-long government assault, thousands of rebel fighters and civilians were bussed out of the city's east.
Syria's conflict erupted with protests against Assad but has since developed into a full-blown war that has drawn in global powers.
Today, Ankara-backed rebels advanced against Kurdish militia in northwest Syria, coming to within two kilometres (just over one mile) of the flashpoint town of Afrin, according to the Observatory.