UPDATE (late Sunday Tehran time): For some periods on Sunday, the Internet connection was completely shut down in Tehran. Throughout the day, the connections slowed to a crawl. AP reports that Internet service providers in Tehran have told the news agency that the problem is not on their end and is not a technical glitch. The government is slowing down the Internet traffic to stop news dissemination within Iran and to the outside world in anticipation of Monday's expected 16-Azar nationwide demonstrations.
UPDATE: AP confirms that the government has suspended accreditation for journalists working for international media in Iran from Monday to Wednesday.
UPDATE: Those trying to access the popular Balatarin site in Iran are redirected to the pro-government Sabz Nabavi website (TehranBureau, 0320 Monday Tehran time).