Opposition websites and eyewitnesses report from Tehran that "security forces opened fire on anti-government protesters in the capital Sunday, killing at least four people in the fiercest clashes in months," the Associated Press writes.
The Guardian adds that:
The reformist website Rah-e Sabz reported that an elderly man was among the dead after being shot in the forehead at a crossroads in Tehran city centre. Three others were said to have been shot nearby at Kalej bridge, in Enghelab Street. Rah-e Sabz, citing witnesses, said crowds held up the elderly man and started chanting slogans against Iran's supreme leader, Ayatollah Ali Khamenei.
The Los Angeles Times writes that:
The Iranian capital erupted in massive and fiery protests today as thousands of protesters clashed with security forces on the occasion of an important Shiite Muslim holiday.
A witness told The Times that Iranian security forces have opened fire with live ammunition against unarmed protesters in a central square in the capital.
At Twitter, a search of #iranelection turns up many links to reports and videos said to have been taken today.
The website Enduring America has collected several of the videos here. (Since authorities in Iran make it nearly impossible for independent news media to report from there, videos said to have been taken by protesters are among the only means of keeping tabs on what's happening.)
Al Jazeera, meanwhile, says the Iranian government is denying the reports about deaths.