Sites belonging to Iranian news agencies, President Mahmoud Ahmadinejad and Iran’s supreme leader Ayatollah Ali Khamenei, were knocked off-line on Monday. Activists had encouraged anti-government protesters to use automatic Web page refresh tools such as Pagereboot.com, to hit government run sites. One such tool, called BWRaeper, was posted to an Iranian sports forum on Monday. Another tool is being promoted via Twitter and blogs, and hosted by activists in the U.S.”]
Source: https://www.csoonline.com/article/2124121/with-unrest-in-iran–cyber-attacks-begin.html