From Jerusalem Post:

Military sources said the IDF fired an advnaced Tapuz-type missile at a Syrian artillery cannon.

At the same time, Israel sent a warning message to the UN, saying that any further firing into Israel will result “in a real response,” sources added.

Israel limited its return fire, since its policy is to only fire intensively in response to coming under major Syrian fire. “We didn’t continue firing because this was one mortar we were responding to,” the source said.

“We will not accept any firing into our territory,” he added. “This was a signal to the Syrians, that we will not be so forgiving of everything that lands in a territory.” The source stressed that as of now, Israel and Syria were not a in a conflict situation.

Read more:  http://www.jpost.com/Defense/Article.aspx?id=291326