During the past few years, Israel has frequently attacked military targets in Syria in what is considered as an attempt to prop up terrorist groups that have been suffering heavy defeats against Syrian government forces.
Hezbollah is helping lead the offensive but keeping a low profile, pro-Damascus sources told Reuters.
Rebels said on Friday that they had reached an agreement with Russian mediators to end violence in southern Syria and surrender the crossing point with Jordan after Syrian government forces, following an intense aerial campaign, captured new areas along the border.
The Israeli military "attacked a Syrian outpost" after mortar shells were fired from that area towards the occupied Golan Heights, the IDF said in a statement on Friday.
Syrian government forces launched a wide offensive on June 19 to retake Daraa and the nearby Quneitra region that borders the Israeli Golan Heights.
"The talks will resume, but they are waiting to see whether the meeting will be in the Nassib border crossing or in Busra al-Sham, the same place as last time", said Hussein Abazeed, a spokesman for militants, on Thursday.
Several witnesses along the Jordan border fence with Syria said they spotted armoured vehicles and a tank with a Russian flag heading to the Nassib crossing, an important trade artery.
The UN refugee agency has urged Jordan to open its borders to Syrians fleeing their homes.
Rebel sources said Russian Federation would guarantee the safe return of civilians who fled the government offensive in the biggest exodus of the war, with 320,000 people uprooted.
The negotiations collapsed on Wednesday, with rebels blaming Russian Federation, ushering in a day-long volley of air strikes, barrel bombs, and missiles that ultimately pressured rebels to return to the table.
The Syrian Observatory for Human Rights, a war monitor, reported that both sides agreed on an immediate and full cease-fire in the area.
Rebels say Russian Federation has insisted that opposition factions hand over their heavy weapons all at once, while rebels want to relinquish their arms in several phases.
Fighters who reject the agreement will be evacuated with their families to the rebel-held northwestern province of Idlib, it added.
The Observatory said Syrian troops were now about three kilometers (2 miles) from the Naseeb border crossing.
Almost 150 civilians have died since the government assault in the south began two weeks ago, according to the observatory.
Rebel territory in southern Syria was included in a cease-fire zone created a year ago in a deal between Washington, Amman, and Moscow, but that did little to halt the government's assault.