Damascus - Dozens of civilians were killed in attacks by Syrian government and Russian forces on Sunday in Syria's Damascus suburbs, sources told Al Jazeera.
Ahmad, an officer from the Douma branch of the Syrian Civil Defence department, told Al Jazeera that government air strikes and rocket barrages targeted Ghouta district in the Damascus suburbs.
"At least 35 civilians were killed in the attacks on Douma alone, another 250 have been injured," he said. "A school was targeted, in which injured students have been taken to the nearest medical points."
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The raids began at about 08:30 local time (06:30 GMT).
"In the past three months, these areas have been constantly targeted by rocket attacks and air strikes, not one of those killed was a fighter - all of those killed were civilians," said Ahmad. "People are paying the price for this armed conflict every day."
The UK-based Syrian Observatory for Human Rights put the death toll at 28 civilians killed, adding that figure was likely to rise as many of the wounded were in critical condition.
'Massacres are happening'
Speaking to Al Jazeera, Douma-based photographer Muhammad al-Abdullah said he awoke to the sound of air strikes on Sunday morning.
"Most people are hiding in their cellars. Three air strikes landed next to my house. Massacres are happening here," Abdullah said.
Government forces also targeted the nearby town of Saqba, also situated on the outskirts of Damascus, witnesses said.
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Sunday's deaths occurred a day after the central Syrian city of Homs was rocked by a deadly car bombing that killed 16 people.
The Islamic State (ISIS) group claimed responsibility.
The Syrian conflict - which began as a peaceful protest in March 2011 - has led to at least 250,000 deaths, according to the UN.
More than half of Syria's pre-war population of 22.4 million have been internally displaced or fled abroad.