It would "appear" that .Gov has made this one of their enforcement actions.
(CNN) The United States government has seized dozens of US website domains connected to Iran, linked to what the US says are disinformation efforts, a US national security official told CNN.
Some users are not able to access sites like Presstv.com, which is an Iranian state run English language news outlet. When attempting to access, users are seeing the following message:
"The domain presstv.com has been seized by the United States Government in accordance with a seizure warrant pursuant to 18 U.S.C. ... as part of a law enforcement action by the Bureau of Industry and Security, Office of Export Enforcement and Federal Bureau of Investigation."
Iran's semi-official Fars News Agency on Tuesday reported the US has blocked the websites of several news agencies including Iranian state-run Press TV.
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Full story (other sources on the net also)
Here's the press release from the Department of Just Us.
If you want to see the big screen live color version
here you go.