Businesses, banks and even state organisations are not spared by the widespread disruption in the Internet, local media say.
"The Internet is in a coma," said the Ghanoon daily in a report in early this month. "It only happens in Iran: the election comes, the Internet goes," it said, quoting a tweet in Farsi.
Facebook, Twitter, YouTube and numerous other sites,including thousands of Western ones, have been censored in Iran since massive street demonstrations that followed the re-election of President Mahmoud Ahmadinejad in 2009.
Those protests -- stifled by a heavy-handed crackdown that led to numerous arrests and even deaths -- were instigated online and observers say the authorities are choking the Internet to prevent a recurrence.
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