Chinese search engine under attack

Chinese search was under attack for at least 4 hours by some cyber army called "Iranian Cyber Army". They call it themselves. Baidu users were redirected to a site claiming a political banner having message in Persian. Last year the same group attacked a social network "Twitter". Twitter users were also redirected towards a page with political message.
Baidu officials said that today morning their search engine domain name was tampered in U.S. Baidu is a popular search engine in China.