Another clip has emerged from the Iranian-built shrine in Raqqa, Syria, now held by insurgents. As Martin Kramer explains, the revelations are meant to shock Sunnis, but may also serve to mobilize Shiites.

What is the connection of a monumental shrine in Raqqa, Syria, to Ayatollahs Khomeini and Khameneh'i, and why is their portrait being defaced at its entrance? Martin Kramer goes to the sectarian strife at the heart of Syria's civil war.