Israeli warplanes conducted overnight airstrikes on military positions in southern Syria’s Quneitra and Daraa provinces.

More than 12 mass graves were discovered Monday in Daraa Governorate in southern Syria containing the remains of bodies believed to be civilians killed by the regime of ousted leader Bashar Assad.

Syrian opposition groups have claimed to have taken control of the key city Daraa, near the Jordanian border in southern Syria.

A Syrian army officer was killed Wednesday in an Israeli air strike in the country’s south, the official SANA news agency reported, citing a military source.