The perpetrators at this stage are unknown, although Phayul.com is an independently run and self reliant news portal of the Tibetan community. This is another perfect example of the increasing infringement on freedom of speech.
http://drichu17.phayul.com/news/article.aspx?id=28532&article=Leading%20Tibetan%20news%20portal%20suffers%20from%20DDoS%20attacks
