"Heavy short-range rockets flew to the Jabhat al-Nusra [Nusra Front] terrorists' locations and supply lines at the triangles of the al-Oueini and al-Heyl valleys in the mountainous region of Aarsal. The attack resulted in great destruction at the site of the shelling and liquidation of a large number (of terrorists)," the source said.
According to the source, the Hezbollah militants managed to take control of four more areas bordering Syria in the area south of Aarsal.
"The Syrian Air Force aircraft struck at positions of Jabhat al-Nusra in the mountainous region of Flita (on Syrian territory) bordering the mountainous region of Aarsal," the source added.
On Tuesday, Lebanese Prime Minister Saad Hariri said that the government supported the Lebanese army's plans to hold a massive counterterrorist operation in the area, but noted that there was no coordination between Syrian and Lebanese forces.
The hard-to-reach mountainous region of Aarsal is considered today the most tense place on the Lebanese-Syrian border. It has been used for arms smuggling and transit of new terrorist recruits to Syria. It also houses several camps for thousands of Syrian refugees.