Reporters Without Borders is outraged at this latest escalation in the government’s attempts to suppress the right to inform the public via the Internet in Iran. After closing or blocking several sites and arresting several of their staff members, the Tehran authorities are now summoning, arresting and threatening journalists suspected of having links to these sites.

More here. And an good overview by Hoder, who adds:

Hardline consrvatives are very concerned when it comes to foreign press. So please help us spread the word in the blogosphere — by linking to the post or to other related resources — and give the news maximum exposure.

UPDATE: The Pentagon is censoring web sites as well.