The Iran Meteorological Organization has reported to the Iranian Parliament that the reason it was unable to provide sufficient warning to Tehran citizens ahead of a June 12, 2014 sandstorm that claimed five lives and injured 44 Tehran citizens, was the Iranian authorities’ practice of jamming international broadcast signals, according to a July 22 article in Etemad Newspaper. Signal jamming is routinely carried out by Iranian authorities as a means to block all but state-approved broadcasts from reaching Iranian citizens.
Full article:
http://www.iranhumanrights.org/2014/07/jamming-satellite/