Spiraling escalation: Nations line up behind Saudi Arabia and Iran (part 2)
Saudi Arabia has cut diplomatic ties with Iran after the storming of its embassy in Tehran. The Iranians warn of "divine vengeance" over the New Year's execution of a prominent Shiite cleric, Nimr al-Nimr. Protests are raging all over the Muslim world. The crisis is occurring on the watch of a new king in Saudi Arabia, which has a sizable Shiite majority in its own land. How far will the escalation go?