Several mortars fired by Syrian government troops targeting rebels hit open agricultural fields on Israel's Golan Heights region on Tuesday morning, the Israel Defense Forces said. No one was wounded in the shelling.

The IDF said on its website that it would not accept the spill over of violence from Syria into Israel and that it has filed a complaint with United Nations forces operating in the border area.

The mortars landed near Kibbutz El Rom in the northern Golan Heights, marking the first time such an incident has taken place. The shells were apparently not aimed at Israel, rather at rebels in Syrian villages close to the border.

Heavy fighting between Syrian troops and rebels was reported in Syria's Quneitra region, which lies along the border with Israel.

There have been concerns in Israel that the ongoing internal violence in Syria could spill over the border and that the long-quiet frontier area could become a new Islamist front against Israel.