Protests Continue in Iran, Could Civil War Be Next?

Nearly a month after the landslide election victory of President Mahmoud Ahmadinejad set off massive protests in the streets, unrest continues in Iran. Protesters are reportedly planning a massive uprising on Thursday, the tenth anniversary of the Tehran University massacre, when police attacked students who were protesting the closure of a pro-reform newspaper. The Republican Guard has announced that it's taken over control of the nation's security, and rifts between clerics are growing. Will the opposition be able to mount Thursday's protest? As tensions increase, is civil war a possibility? How is the instability viewed outside of Iran? Is Israel likely to make a strike against the country's nuclear facilities?