An Iranian riot police officer, center, is held aloft by protesters as they put a green scarf, a symbolic color of the opposition, on his head after their clash during anti-government protest at the Enqelab (Revolution) St. in Tehran, Iran, Sunday, Dec. 27, 2009. (AP Photo)
Photo essay: Opponents and supports on the streets
by Boston Globe
Iranian protesters shout during clashes in central Tehran December 27, 2009. (REUTERS/Stringer)
Photo essay: Opponents and supports on the streets
by Boston Globe
An opposition supporter covers his face with his bloodstained hand during clashes with security forces in Tehran on December 27, 2009. (AMIR SADEGHI/AFP/Getty Images)
Photo essay: Opponents and supports on the streets
by Boston Globe
Iranian opposition leader Mir Hossein Mousavi (center) receives condolences for the death of his nephew Seyed Ali Habibi-Mousavi in Tehran. Seyed Ali Habibi-Mousavi, the 35-year-old nephew of Mir Hossein Mousavi, was shot dead in Tehran during protests on December 27 which turned into the bloodiest showdown between opposition protesters and security forces in months. Iranian police said on December 29 that "terrorists" killed the nephew of opposition leader Mir Hossein Mousavi in an incident unrelated to anti-government riots. (Arash Ashourinia/AFP/Getty Images)
Photo essay: Opponents and supports on the streets
by Boston Globe
Injured members of an Iranian security service sit protected by Iranian opposition supporters during clashes with security forces in Tehran on December 27, 2009. (AMIR SADEGHI/AFP/Getty Images)
Photo essay: Opponents and supports on the streets
by Boston Globe
Iranian protesters take a policeman away to a safe place after he was beaten by angry protesters during fierce clashes in central Tehran December 27, 2009. (REUTERS/Stringer)
Photo essay: Opponents and supports on the streets
by Boston Globe
A teargas canister, fired towards Iranian opposition supporters, is thrown back during clashes with security forces in Tehran on December 27, 2009. (AFP/Getty Images)
Photo essay: Opponents and supports on the streets
by Boston Globe
Iranian protesters flash the victory sign, as they cover their faces to avoid to be identified by security during anti-government protest in Tehran, Iran, Sunday, Dec. 27, 2009. (AP Photo)
Photo essay: Opponents and supports on the streets
by Boston Globe
A dead body of a man who allegedly was shot during anti-government protest at the Enqelab (Revolution) St. in Tehran, Iran, Sunday, Dec. 27, 2009. (AP Photo)
Photo essay: Opponents and supports on the streets
by Boston Globe
A protester throws a stone at riot police during fierce clashes in central Tehran on December 27, 2009. (REUTERS/Stringer)
Photo essay: Opponents and supports on the streets
by Boston Globe
An Iranian protester flashes the victory sign during anti-government protest in Tehran, Iran, Sunday, Dec. 27, 2009. (AP Photo)
Photo essay: Opponents and supports on the streets
by Boston Globe
A protester throws a stone at riot police as protesters set their motorbikes on fire during fierce clashes in central Tehran, Iran on December 27, 2009. (REUTERS/Stringer)
Photo essay: Opponents and supports on the streets
by Boston Globe
Iranian security forces on motorcycles surround opposition protesters during clashes in Tehran on December 27, 2009. (AFP/Getty Images)
Photo essay: Opponents and supports on the streets
by Boston Globe
Iranian protesters hold a rally on the Shi'ite mourning day of Ashoura in central Tehran, Iran December 27, 2009. (REUTERS/Stringer)
Photo essay: Opponents and supports on the streets
by Boston Globe
Iranian riot police run towards opposition protesters during clashes in central Tehran December 27, 2009. (REUTERS/Stringer)
Photo essay: Opponents and supports on the streets
by Boston Globe