The Syrian offensive has swept into swathes of insurgent territory in Deraa province, helped by heavy Russian air strikes.
Israel must draw the lessons from the successful Russian intervention in Syria – only to do the exact opposite.
The battles have pushed more than 270,000 people out of their homes.
Syrian opposition media said the explosions were the result of an IDF air strike.
Assad's offensive in the southwest has been backed by air strikes and shelling that have killed 93 civilians since June 19.