At least 35 people were killed on Tuesday when a rocket hit a busy market place in an eastern suburb of the Syrian capital Damascus, state media said, while rescuers said Syrian and Russian airstrikes killed dozens in nearby rebel-held areas.
The assault has displaced 45,000 people, according to the United Nations.
The evacuees will leave toward rebel-held areas in the northwestern province of Idlib, the report added.
Rebels fighting the Assad regime in one of the largest towns in the besieged enclave of eastern Ghouta are reported to have surrendered and to be preparing to be ferried in buses to northern Syria. The Syrian opposition has criticized such agreements, saying they reward the government's siege tactics and legitimize the forced displacement of civilians from their homes. Before the latest offensive, it was estimated that 400,000 people were trapped in the besieged region.
"The situation in the city is catastrophic", said Iyad Abdel Aziz, the head of Douma civil council, adding that the plight of more than 150,000 civilians mostly taking refuge in basements had worsened.
"The oldest among them is 11", he said.
Assad and his allies are also attacking rebels in eastern Ghouta, near Damascus, in an offensive that has involved intense bombardment.
The surrendering rebels reached the humanitarian corridor established recently by the Syrian army near the Water Resources facility in Harasta, said the report.
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Monther Fares, a spokesperson for the powerful Ahrar al-Sham group, said the deal gives security guarantees for those who decide to stay in the town after the government takes over. "We just saw him in the morgue", the woman told Al-Ikhbariya.
The ministry's letters came in the wake of a deadly attack mounted by terrorists positioned in Eastern Gouta who launched a rocket on a bustling public market in Kashkoul area in Jaramana near Damascus.
Government forces, meanwhile, continued to pound remaining opposition-held areas with shelling and airstrikes.
The video, said to have been filmed on Tuesday, shows damage to buildings and cars on fire.
Eastern Ghouta, a 105-square-km agricultural region consisting of several towns and farmlands, poses the last threat to the capital due to its proximity to government-controlled neighborhoods east of Damascus and ongoing mortar attacks that target residential areas in the capital, pushing people over the edge.
UK Foreign Secretary Boris Johnson said Wednesday that while Syrian President Bashar Assad may fear punishment for civilian deaths in the country, the old slogan of "Assad must go" is no longer tenable. Russia's Maj. Gen. Vladimir Zolotukhin said 300 civilians and 15 militants have exited through the corridor in the past 24 hours.
A day earlier, the Minister of National Reconciliation Ali Haidar said the planned evacuation of rebels is awaiting consensus among the militiamen in that area after an agreement was recently reached.