"Hacktivist" collective Anonymous has released a video vowing to unleash an "electronic holocaust" on Israel on April 7, in retaliation for crimes "in the Palestinian territories."

In the video, a masked figure in a suit wearing Anonymous' trademark white mask reads out a statement, vowing, "We will erase you from cyberspace as we have every year. The seventh of April 2015 will be an electronic holocaust."

Along with the masked figure, the video also shows footage of Prime Minister Benjamin Netanyahu in what looks like a war briefing room, interspersed with footage that looks like it dates from the Gaza war last year.

"This is a message to the foolish Zionist entities, we are here to punish you again for your crimes in the Palestinian territories. all we see is continuous aggression, bombing and kidnapping of the Palestinian people, as in the war against Gaza in 2014."

Speaking in English with Arabic subtitles, the masked figure threatens, "As we did many times, we will take down your servers, government websites, Israeli military websites, and Israeli institutions."

The figure also says that this is "a message to the youth of Palestine, you are a symbol of freedom, resistance and hope: we are with you and will continue to defend you."

Anonymous launched cyberattacks against Israeli websites in the past. The collective first struck in November 2012 after Israel's Operation Pillar of Defense assault on Gaza, and again on April 7, 2013. Last year it also carried out an attack on April 7.