The teenage son of an Israeli Defense Ministry contractor was killed on the Golan Sunday in the most serious incident on the plateau since the Syrian war began.

The Israeli army called the explosion "an intentional attack" on a civilian vehicle by forces inside Syria, with a senior spokesman telling reporters Israeli tanks had fired at Syrian army posts in response.

It was not clear whether there were any casualties on the Syrian side.

Israeli public radio cited security sources as saying that the Syrian army had fired the projectile, but the Israeli army declined to comment on the report.

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