Five projectiles from Syria set off air raid sirens in Israeli towns on Saturday, prompting the Israeli military to say it would step up its response to stray fire from the civil war that has repeatedly spilled over the border.
The projectiles crossed into the Israeli-occupied Golan Heights and the military said it targeted three Syrian artillery guns in response. No damage or injuries were reported in Israel.
The Syrian military said it came under attack in Quneitra province, which sits near the Golan Heights territory that Israel captured from Syria in the 1967 Middle East War.
"The Israeli enemy assaulted one of our military positions this morning, which led to material damages," it said.
During Syria's more than six-year-old conflict, Israel has returned fire, which has repeatedly spilled over the border, including stray shells from fighting among Syrian factions.
The military statement suggested it may start escalating such retaliations.
"Whether errant fire or not, any future occurrences will force the Israel Defense Forces to intensify its response," it said.
Israel "holds the Syrian regime responsible and won't tolerate any attempt to breach Israeli sovereignty," it added.
In its own statement, the Syrian military warned against "such aggressive acts" and said it held Israel responsible for any consequent results.
Israel has also carried out targeted air strikes in Syria during the war, alarmed by the expanding influence of Iran, the Syrian government's ally. The Israeli air force says it has struck arms convoys of the Syrian military and Lebanon's Iran-backed Hezbollah nearly 100 times in recent years.
Iran's military chief of staff warned Israel against breaching Syria's airspace and territory on a visit to Damascus this week.
Opposition factions fighting the Damascus government in the multi-sided war hold swathes of Quneitra, while the Syrian army and allied militias control another part of the province.
Both warring Syrian sides accused each other of prompting the Israeli attack on Saturday.
An opposition official in Quneitra said pro-government fighters had been shelling opposition-held parts of the province, when some of the shells fell on the Golan Heights.
