(CNN) -- "May God bring you pain, Bashar."
The plea is from a woman as she stands over a young child, dressed in purple pants and a matching shirt. Cursing Syrian President Bashar al-Assad, she asks why the girl had to die -- one of eight children killed by shelling Sunday on a playground in a Damascus suburb, according to opposition activists.
The woman's cries are among a host of heartwrenching moments captured on video from Deir al-Assafir. Posted on YouTube, and quickly spreading via social media, it begins by showing the bodies of two seemingly dead little girls on the ground, then two more bodies in a car, then adults carrying even more limp children. A young girl on the pavement cries uncontrollably, before being picked up.
The opposition Local Coordination Committees said cluster bombs from Syrian warplanes killed children while they were playing. Rami Abdulrahman of the Syrian Observatory for Human Rights, however, said it's not known what happened -- noting it is unclear if or, perhaps, why the children were targeted in an area containing al Qaeda insurgents and rebel fighters, or why they were outside after a morning of intense shelling.
Whatever the explanation, the images represent another sordid chapter in Syria's bloody civil war.
About 40,000 civilians have been killed since the first protests sprung up about 20 months ago against al-Assad's government, according to the opposition Center for Documentation of Violations in Syria. Meanwhile, more than 380,000 Syrians have fled the violence and become refugees in countries such as Turkey and Lebanon, the United Nations reports.
On Sunday alone, the carnage in Deir Assafar represented a fraction of the 117 fatalities that the LCC reported nationwide Sunday. That figure includes 55 dead in and around Damascus -- among them 12 bodies found in a hospital in Daraya -- plus 17 in Daraa province and 16 in Aleppo province.
CNN cannot confirm claims by the government or the opposition due to government restrictions that prevent journalists from reporting freely within Syria.
Having begun with security forces cracking down on mostly non-violent demonstrators, the conflict has evolved to feature more fighting between two main groups: the Syrian military and the rebel Syrian Free Army.
Rebel forces scored significant victories over the weekend, according to the Syrian Observatory for Human Rights.
Overnight Saturday, its fighters stormed Marj al-Sultan airport, which is about 20 kilometers (12 miles) from Damascus, destroying two helicopters and a number of vehicles except for a tank that was driven off the airport. In Daraa province, meanwhile, rebels claimed to have taken over a base near the Jordanian border that once housed the Syrian army's fourth battalion.
Many communities around the country -- from Deir Ezzor in the east to Jableh, along the Mediterranean Sea -- saw heavy shelling and explosions, according to the LCC.
The violence has spilled over, too, into neighboring countries.
Turkey has turned against its former ally, asking its fellow NATO members last week for Patriot missiles to bolster its air defenses due to several deaths in its territory blamed on Syrian forces.
The bloodshed has seeped into Lebanon as well, where there have been deadly clashes between pro- and anti-Syrian factions and the assassination of a top intelligence official was tied to the Syrian conflict. And Israel's army fired warning shots toward Syria earlier this month after a mortar shell hit one of its military posts.
-- CNN's Roba Alhenawi, Karen Smith and Greg Botelho contributed to this report.
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