Anonymous has laid claim to the downing of 500 Israeli web pages as part of a cyber attack by the group in support of the people of Palestine.
As part of "Operation Israel" - or "OpIsrael" for short - the emails, passwords and phone numbers of Israeli officials have also been published.
Websites were struck by Anonymous' favourite weapon of choice, the distributed denial of service attack (DDoS). The attacks began on 7 April 2014, which happens to be the eve of Holocaust Remembrance Day.
According to a video posted to YouTube, Anonymous is unhappy with Israel's attacks on Gaza.
"The further assault on the people of Gaza, who have been flooded by your sewage, terrorised by your military apparatus, and left to die at the border while waiting for medical attention will not be tolerated anymore," a text-to-speech bot announced.
OpIsrael chiefly targeted government and administration websites, most of which were knocked offline shortly after the attack began. One of the groups, AnonGhost, is encouraging outsiders to take part in the attack, posting links that direct to tutorials and targets on Twitter and other social media.
Pro-Israeli hackers have launched a counter-attack against the OpIsrael website, which at the time of writing is offline.
Israel's Finance Ministry, one of the groups targeted by the hackers, released a statement assuring the public that the site is safe to use, "as it has been for the entire weekend" according to the Jerusalem Post.
Anonymous and Israel have previous, with the hacking collective once claiming that it would wipe the country "off the face of the internet."