Israel says pro-Palestinian hackers have hit Israeli websites following threats from a hacking collective known as Anonymous that it would carry out an "electronic Holocaust."
The hacking campaign, which has been taking place every April 7 in recent years, is in protest of Israeli policies toward the Palestinians.
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Israel's Computer Emergency Response Team, a civilian cyber security group, says Anonymous attacked a few dozen websites belonging to Israeli musicians and non-profit organizations on Tuesday. No major government websites were affected.
The hackers replaced websites with photos of a Muslim holy site in Jerusalem and of militants holding the Islamic State militant flag, and posted a message signed by "AnonGhost."
A video message by Anonymous said its campaign was responding to "crimes in the Palestinian territories," including last summer's Gaza war.