Are Israel and Iran about to clash head-on over Syria?

Professor Scott Lucas and Umer Karim write for The Conversation: Just two weeks after missile attacks by the US, UK and France, a series of explosions rocked three Syrian government military positions in northwest Syria on April 29. At one of the sites, the 47th Brigade base south of Hama, at least 18 Iranian Revolutionary Guards were killed, with more personnel wounded. Few onlookers thought there was any mystery about which country carried out these attacks.