Opposition candidate Mir-Hossein Mousavi continues to criticize Iran's leadership and on Thursday vowed to pursue his challenge to the election. The declared winner, President Mahmoud Ahmadinejad, spoke out as well, aiming his criticism at the United States. Arang Keshavarzian of New York University discusses what form protests may take in coming days.

On the surface, the turmoil in Iran has been attributed to anger over the disputed election -- but a deeper religious struggle is also taking place within Iranian politics, says Geneive Abdo of The Century Foundation.

In Iran on Thursday, hundreds of thousands turned out to mourn those killed during days of protests surrounding the country’s disputed presidential election. An anonymous journalist in Iran describes the climate on the ground, and Ervand Abrahamian of the City University of New York discusses how the unrest will play out.

Iran's supreme leader has ordered an investigation into claims of fraud in the country's recent presidential election. Ervand Abrahamian of the City University of New York discusses the election results and how this complicates U.S. President Barack Obama's desire to start a dialogue.

Today, Iranians exercise their right to vote in a hotly contested election that pits incumbent Mahmoud Ahmadinejad against three opponents. Due to heavy turnout, voting has been extended several hours, and tallies will begin coming in throughout the night.