More than 3,000 civilians have been killed in US-led coalition air strikes against the Islamic State group in Syria since they began four years ago, a monitor said on Sunday.

Four years of coalition strikes on Syria kill 3,300 civilians: Monitor

The White Helmets rescue force, nominated for the Nobel Peace Prize, are often the first responders to airstrikes in war-ravaged Syria

Syria's White Helmets: Real-life heroes who run towards bombs

Damascus and its Russian allies are committing 'a crime' in Aleppo, they say

Syrian opposition lashes out at 'silence of international community'

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Four years of coalition strikes on Syria kill 3,300 civilians: Monitor

Syria's White Helmets: Real-life heroes who run towards bombs

Syrian opposition lashes out at 'silence of international community'