Definitive proof they'll provide to American and European officials. They mean business.
I don't know about Iran, but it's clear the Syrian govt is not long for this world. Financing, the Iranians can explain away---misappropriated funds, diverted funds, whatever. But planning, the Syrians cannot explain away. Definitive proof of Syrian planning, that's all they need.
The only remaining question is the firmness of the Israeli govt. If they don't find a leader and a voice they are likely to wind up with a uniform and a boot in charge of things. Sharon picked a bad time to get old.
Binyamin Netanyahu and someone from the Kadima are going to come *foreward* in unison againts Syria...within 3 days. There are more than enough qualified * diplomats * in Israel... ;)