Hacktivist group Anonymous has attacked the websites of El Salvador's presidency and government ministries, forcing several to be shut down.
The group's "Operation Justice El Salvador" comes two weeks after Anonymous threatened several government websites, according to Australian reports.
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The website of the presidency was suspended at the weekend after it was bombarded with 30 million hits on Saturday in a denial-of-service (DoS) attack.
Websites for the legislative assembly, the national civil police and the ministries of justice, economics and labour were also targeted.
Anonymous has claimed responsibility for dozens of similar attacks, including the recent defacing of a website of Syria's Ministry of Defence to protest against a crackdown on anti-government protesters.
Last year, Anonymous launched retaliatory attacks on companies perceived to be enemies of the whistle-blowing website WikiLeaks.
Public and private organisations should not ignore the risk posed by Anonymous and allied groups and should put more time and money into defending against these attacks, say security experts.
Security professionals should concentrate on web security, particularly defending against DoS attacks, while leaders of organisations should decide how they will deal with such attacks when they happen.