Militant Islamic groups are urging their followers to conduct 'electronic Jihad' on Jewish websites, according to the Simon Wiesenthal Centre.

Rabbi Abraham Cooper, an associate dean at the Los Angeles-based Jewish organisation, told Reuters that one of the centre's researchers had come across two websites in Arabic referring to a three-day campaign of hacking into Jewish sites, starting tomorrow.

The Simon Wiesenthal Center monitors extremist anti-Semitic publications and websites on a regular basis, but Mr Cooper said the latest find this week was particularly alarming because one of the websites gave 'how to' tips to would-be hackers.

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