Tehran , Iran ( CNN ) -- Iranian authorities will observe and control text messages and e-mails that encourage protesters , an Iranian semi-official news agency reported Friday . Messages that encourage demonstrations will be screened , and organizers of illegal protests will face heavy penalties , the Iranian Labor News Agency reported , citing Tehran Police Chief Ahmadi Mogadham . Iran has clamped down on protests nationwide since mass demonstrations erupted after a disputed presidential election last June . Hard-line President Mahmoud Ahmadinejad was declared the winner over main opposition candidate Mir Hossein Moussavi . Full coverage of the protests in Iran . Many of the protesters e-mailed images worldwide of demonstrators clashing with police , filling the void created by strict government controls on foreign media outlets . Protesters were also active on social networking sites including Twitter and Facebook where one pro-democracy page has more than one quarter of a million members . The mass arrests that followed the protests have led to widespread accusations of authorities torturing and otherwise abusing prisoners . A report released Sunday by an Iranian fact-finding committee found that 147 detainees held after last summer 's post-election protests were stuffed into a small room , deprived of adequate food and subjected to other mistreatment , Iranian media reported . The 147 detainees at Kahrizak Detention Center were held with 30 additional inmates for four days in a 750-square-foot room lacking proper ventilation , the parliamentary report found , according to the semi-official Mehr News Agency . The fact-finding committee blamed former Tehran prosecutor Saeed Mortazavi for the decision to send the detainees to Kahrizak -- usually reserved for rapists and other dangerous criminals -- instead of Evin prison , which had informed Mortazavi that it had the space for them . `` Even if Evin prison had been full , it was not justified to send other offenders to this special site , '' the investigation found , according to Mehr . Iran 's supreme leader , Ayatollah Ali Khamenei , ordered the Kahrizak facility shut down after reports of mistreatment surfaced . Three prison officials have been charged with premeditated murder in the beating deaths of three imprisoned protesters . According to the investigation , Mortazavi had claimed the three died of meningitis , Mehr said . Sunday 's report found that the 147 detainees arrested July 9 suffered `` harsh corporal punishment , humiliating and insulting techniques , '' and other mistreatment , Mehr said . `` The deaths of some detainees were a result of beatings and neglect of the physical condition of the injured by the detention center 's officials , '' an excerpt of the report said on the Mehr Web site . The investigation did not reveal evidence of rape or sexual abuse , as alleged by reformist Mehdi Karrubi , Mehr and state-run Press TV reported . Karrubi , a former parliamentary speaker , and fellow reformist Moussavi , had publicly accused the government of allowing rape , torture , wrongful deaths and secret burials of several detainees . Karrubi had been especially vocal about the claims of detainee rape -- even publishing a first-hand account of one alleged victim on his Web site in October . The parliamentary committee met with Karrubi about the claims , but he `` did not present any convincing evidence or reliable documentation of the alleged abuse , '' Mehr said the report found .
Iranian press agency reports Iranian government to monitor e - mail , texts . Government trying to discourage protests that erupted after disputed presidential election . Organizers of illegal protests said they will pay hefty fines . Government alleged to have tortured and executed prisoners arrested as a result of the protests .