The loose-knit group of online global hackers known as "Anonymous" has trained its sights on Yemen following cyber attacks on government websites in Tunisia and Egypt.
The website of Yemen President Ali Abdullah Saleh, presidentsaleh.gov.ye, was inaccessible on Thursday following calls by Anonymous members for attacks on the site.
Luis Corrons, the technical director at PandaLabs, the malware detection laboratory for computer security firm Panda Security, said Anonymous members "feel that somehow they have to support the people in those countries."
The attacks on Yemeni websites came a day after Anonymous "hacktivists" resumed attacks on the websites of Egypt's ruling National Democratic Party, the Ministry of Interior, Ministry of Information and others.
The hackers first began attacking Egyptian government websites on January 26, according to computer security experts, as part of a campaign dubbed "Operation Egypt" before the authorities there shut down the Internet.
Those sporadic Distributed Denial of Service (DDoS) attacks on official Egyptian websites resumed on Wednesday after the country went back online but most Egyptian sites were accessible on Thursday.
Anonymous last month managed to shut down the Tunisian government's official website, the national stock exchange site, and other sites during a popular uprising that led to the ousting of the country's dictator.
In a typical DDoS attack, a large number of computers are commanded to simultaneously visit a website, overwhelming its servers, slowing service or knocking it offline completely.
In December, members of Anonymous attacked the websites of Amazon, PayPal, Mastercard, Visa and others for withdrawing their services to WikiLeaks, the anti-secrecy website.
PandaLabs' Corrons said he was not in a position to say how many people were involved in the latest attacks, but the highest number seen during the attacks on companies seen as taking steps against WikiLeaks was around 5,000.
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