<p>On Sept. 6, something important happened in northern Syria. Problem is, no one knows exactly what. Except for those few who were involved, and they're not saying.</p>
<p>We do know that Israel carried out an airstrike. How then do we know it was important? Because in Israel, where leaking is an art form, even the best-informed don't have a clue. They tell me they have never seen a better-kept secret. Which suggests that whatever happened near Dayr az Zawr was no accidental intrusion into Syrian airspace, no dry run for an attack on Iran, no strike on some conventional target such as an Iranian Revolutionary Guard base or a weapons shipment on its way to Hezbollah in Lebanon.</p>