"The attackers stole two ambulances, helmets and communication devices", Hossam Halaq told Anadolu Agency.
"The civil defense center in Sarmin was the target of an armed attack by an assailants in which seven volunteers were killed", the White Helmets said in statement.
The killings happened in the jihadist-held northwestern town of Sarmin, six miles (9km) east of the city of Idlib.
Ankara, Beirut- Rage prevailed in Idlib on Saturday after seven volunteers with the Syrian civil defense rescue service were killed in a shooting by unidentified attackers in rebel-held Idlib province on Saturday, while Turkey continued to adopt restrictions to control the border with Syria.
The UK-based Syrian Observatory for Human Rights said the seven volunteers who died had all been shot in the head.
Although its volunteers work in exclusively rebel-held areas, the group insists it is not partisan.
Their detractors, including President Bashar al-Assad's government and his ally Russian Federation, accuse them of being the tools of their worldwide donors.More news: Cash-strapped SoundCloud gets new funds and top management
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The SCD receives millions of pounds worth of funding from many Western government including the United Kingdom and the US.
Critics also accuse them of harbouring rebel fighters, including jihadists, in their ranks.
No one claimed responsibility for the rare attack but it came amid tension in the area.
Abu Kifah was captured on camera crying as he pulled a baby girl alive from the rubble of a bomb blast.
According to unverified statistics compiled by the White Helmets, volunteer rescuers have saved more than 85,000 civilians since the group's inception.
The organization, the subject of a film that won this year's Academy Award for best documentary short, has been targeted in the past.