Al Arabiya reports that two men from Iran, who speak Arabic, were caught in the Syrian city of Hama by the Syrian opposition. They seem to have admitted working for the Syrian dictatorship..
There have been a number of reports of both Hezbollah and Iranian Revolutionary Guards in Syria acting on behalf of the Assad regime, but this seems to be the first confirmation.
Here is a video of the two:
Iran: Trying very hard to start a war with the US
44 minutes ago