Protesters view a burning car next to the building of pro-government militia base near a rally supporting leading opposition presidential candidate Mir Hossein Mousavi in Tehran, Iran, Monday, June 15, 2009. Some hundreds of thousands gathered in Azadi (Freedom) square in Tehran to support Mousavi, who claims there was election fraud in Friday's presidential vote.(AP photo/Vahid Salemi)
Protesters view a burning car next to the building of pro-government militia base near a rally supporting leading opposition presidential candidate Mir Hossein Mousavi in Tehran, Iran, Monday, June 15, 2009. Some hundreds of thousands gathered in Azadi (Freedom) square in Tehran to support Mousavi, who claims there was election fraud in Friday's presidential vote.(AP photo/Vahid Salemi) Associated Press
Protesters view a burning car next to the building of pro-government militia base near a rally supporting leading opposition presidential candidate Mir Hossein Mousavi in Tehran, Iran, Monday, June 15, 2009. Some hundreds of thousands gathered in Azadi (Freedom) square in Tehran to support Mousavi, who claims there was election fraud in Friday's presidential vote.(AP photo/Vahid Salemi) Associated Press

Obama cautious as violent protests sweep Tehran

June 15, 2009 11:01 AM