Israeli aircraft targeted three positions from which the projectiles were fired, the IDF said.
The sources reported that a number of injured members of Al-Nusra Front (also known as Fatah al-Sham Front or the Levant Liberation Board) have been transferred to the Israeli hospitals via al-Hamidiyeh region in Quneitra countryside.
Intense fighting has rocked the Quneitra province of Syria, adjacent to the Golan Heights, since rebels there launched an attack on Saturday.
Regarding the incident that prompted Israel's weekend strike in Syria, the IDF said that the mortars fired into the Jewish state appeared to be errant fire originating from clashes between warring factions near the Israel-Syria border.
While the Islamic State and al-Qaida-related groups have controlled Israel's northern border for almost five years, the Syrian regime has recently regained some of its lost territory with the help of Russian air support.
Israeli Defense Minister Avigdor Liberman (with binoculars) at the border with IDF Maj.
Brig. Gen. Nuriel said that the situation in Syria is similar to the way that Israel views the Islamist Hamas movement in the Gaza Strip.
For the second time in 24 hours, Israel bombed Syrian targets in retaliation to Syrian mortar fire.
The Jerusalem Post reported yesterday that the Syrian military threatened Israel with repercussions if it launches further attacks on Syrian army targets.
Israeli seized 500 square miles of the Golan from Syria during its colonialist military campaigns of 1967 and later annexed it. According to Al Mayadeen channel citing a source, at least two Syrian soldiers were killed in the airstrike.
Meanwhile, Maxine Dovere said that Israel responded to "missiles and bombs falling on its territory" and the act of targeting the positions of Syrian forces was for the objective of "defense rather than offense".
Israel has largely stayed out of the fighting during the six-year civil war in neighboring Syria.