Seven members of the White Helmets rescue group were shot dead Saturday by unidentified gunmen who stormed the volunteers' office in northwestern Syria, the group and opposition activists said.
It was active in rebel-held eastern Aleppo before the territory was seized by forces loyal to President Bashar al Assad.
The group also known as the Syrian Civil Defense called for northern Syrian checkpoints to detain any vehicles bearing the White Helmets logo that were not verified.
It was not immediately clear whether the motives for the raid were political or purely criminal.
They receive funding from a number of Western governments, including Britain, Germany, the Netherlands and the United States.
Mobile US (TMUS) Given Daily Media Sentiment Score of 0.23
The Wireless communications provider reported $0.67 EPS for the quarter, topping analysts' consensus estimates of $0.38 by $0.29. The fund bought 24,900 shares of the Wireless communications provider's stock, valued at approximately $1,509,000.
The observatory's director, Rami Abdel Rahman, said: "Colleagues came in the morning for the change of shift and found them dead".
The civil defence, otherwise known as the "White Helmets", operates in rebel-held areas of Syria.
They have since gained widespread worldwide renown for their daring rescues, with footage often taken and circulated on social media.
Their detractors, including President Bashar al Assad's regime and his ally Russian Federation, accuse them of being tools of their global donors.
Sarmin is controlled by the Hayat Tahrir al Sham jihadist alliance, which was formed when the Nusra Front merged with other groups.
- Zidane confirme qu'il va prolonger au Real Madrid
- Canadian pastor returns home after release from North Korean prison
- OutKast's Big Boi Gifts 5-Year-Old Shooting Victim an Adorable Puppy
- Indian woman killed in Pakistani firing at border
- Giroud confirms Arsenal stay after opening-day victor
- Grant Perry Fully Reinstated
- Le scandale des oeufs contaminés touche la France
- Late goal gives Arsenal EPL thriller win
- Manchester United vs West Ham: Potential XI with three at the back
- After voting for sanctions, China tells North Korea to act 'smart'