Israeli forces say they have fired warning shots into Syria after a stray mortar round fired from Syria hit an Israeli post in the Golan Heights.
It is the first time that Israel has fired on Syrian forces since the Middle East war of 1973, the BBC reports.
The latest incident comes days after Israeli troops were put on high alert after a vehicle was hit by Syrian fire in the Israeli-occupied Golan Heights.
The two countries are formally at war and a United Nations force patrols the buffer zone.
The Israel Defence Forces have filed a complaint through the UN forces operating in the area, stating fire emanating from Syria into Israel will not be tolerated and "shall be responded to with severity".
Defence Minister Ehud Barak says additional shelling into Israel from Syria will "elicit a tougher response, exacting a higher price from Syria".