UN human rights officials are condemning Iran's use of stoning as a form of capital punishment among a number of "deeply troubling" rights violations, many of which are "systemic in nature," according to a report.
Ahmed Shaheed, the Geneva-based UN Human Rights Council's special rapporteur on Iran, also called for an "extensive, impartial and independent investigation into the violence in the weeks and months that followed the presidential election of 2009", when pro-democracy protesters surged into the streets to denounce the election of president Mahmoud Ahmadinejad as bogus and rigged.
Mr Shaheed also "reiterates his call for the immediate release of all political prisoners and prisoners of conscience", according the report.
The document will be the basis for a General Assembly resolution critical of Tehran's human rights violations, which will probably be voted on in December.
Mr Shaheed reported that at least 150 journalists have fled Iran since the 2009 elections, and some reports put the number as high as 400.
Iran detained more journalists than any other nation last year, according to his report, and to the New York-based rights group Committee to Protect Journalists, which counted 179 writers, editors and photojournalists jailed in Iran in December last year.
Half of them spent time in solitary confinement, 42% were sent into exile in 2010-11, and half were serving sentences ranging from six months to 19 years on charges such as "working with hostile governments", "propaganda against the state", and "insulting religious sanctities", Mr Shaheed wrote.
As the report was being prepared last March, Iran's foreign ministry said Mr Shaheed was building it on statements by "terrorists" - an apparent reference to the Mujahedin-e Khalq, a small exile group that until recently was listed by the US as a terrorist organisation. The MEK says it has renounced violence, and also represents a very small fraction of the opposition to the government in Tehran.
Iran does not allow Mr Shaheed entry to the country to conduct his research, and regards his reports as punitive. He said he followed 124 cases of human right violations for his report and conducted 99 interviews with individuals inside and outside Iran between February and June.
Iran is also cracking down on internet users, with Mr Shaheed reporting that 19 bloggers and internet commentators are currently detained in the Islamic Republic. Four of those detained - Vahid Asghari, Ahmad Reza Hashempour, Mehdi Alizadeh Fakhrabad and Saeed Malekpour - were sentenced to death in January. They were accused of "enmity against God" and "corruption on earth"; collaboration or engagement with foreign governments; insulting leaders of the country; and launching and maintaining pro-opposition websites.