The official told AFP that two fighters were also wounded in the attack on the Al-Fawwar camp near Quneitra in southwestern Syria, adding that it was unclear whether the damage was inflicted by an air strike or shelling.
The Syrian Observatory for Human Rights monitoring group confirmed today's attack but had no further details.
Israel's army on Friday said it targeted positions inside Syria in retaliation for mortar fire that hit the northern part of the Golan Heights.
The Syrian government labels rebel groups and jihadists fighting the regime as "terrorists" and accuses Israel of backing them.
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Israel seized 1,200 square kilometres (460 square miles) of the Golan from Syria in the Six-Day War of 1967 and later annexed it in a move never recognised by the international community.
Around 510 square kilometres of the Golan are under Syrian control.
The two countries are still technically at war, although the border remained largely quiet for decades until 2011, when the Syrian conflict broke out.
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