It wasn't the Mossad, Jew bashers, it was archetypical Muslim vs. Muslim carnage. From Iran: Syria Arrests Saudi Official Over Mughniyeh Assassination:
In a move that could have far reaching consequences, Syria arrested a Saudi official in connection with the assassination of top Hizbullah commander Imad Mughniyeh, Iran's semi-official Fars news agency reported Tuesday. A high-ranking defense official in Saudi Arabia's embassy in Damascus, who was connected to a Syrian woman in whose name the two explosives-laden cars used to kill Mughniyeh were registered, was arrested by Syrian security forces.
An Iranian source said locals with Syrian, Jordanian and Palestinian citizenships executed the operation. The men rented apartments near Mughniyeh's residence in Damascus and surveyed his activities from there.