Israel fired a warning shot into Syria on Monday for a second day running after a mortar round hit the Israeli-occupied half of the Golan Heights, security sources said.

The exchange came just hours after an appeal for restraint from all sides by UN chief Ban Ki-moon.

An Israeli security source confirmed that troops had returned fire after a mortar round from Syria hit the central sector of the strategic plateau, causing no casualties or damage. The Israeli army confirmed a direct hit on the source of the Golan fire.