Hacker-collective Anonymous launched an attack on Israel, beginning Tuesday morning.

Dubbed "OpIsrael," this is the fourth annual operation that aims to "erase Israel from the Internet," in retaliation for the occupation of the Palestinian Territories.

The group targeted government sites, including the Knesset portal (which appeared to be down early Tuesday morning), as well as the Israeli court system and the Education Ministry. However, later reports by the Times of Israel, said that only the old Education Ministry website was hacked, not the current one that is in use.

Although over 6,000 emails were leaked via other websites, the mission was largely claimed to be a "fail" by the Israeli government.  Israel media claims that the attacks were made "primarily" from users in Morocco and Saudi Arabia.

Experts say that despite the fact that the hacker group's techniques have evolved over the years, their attacks have been less effective.

Benjamin T. Decker, an intelligence analyst at the Tel Aviv-based consultancy the Levantine Group, told Newsweek that, “As the years have progressed we have seen that, despite their increasing sophistication in hacking techniques, we have seen less damage against Israeli cyber infrastructures, largely due to Israel’s pioneering of most cyber warfare tactics, both offensive and defensive.”

Anonymous is amorphous in structure. By pledging allegiance to the group, a person is automatically a member. While this has allowed the group to continue hacking when the American government arrested  Hector Xavier Monsegur (Sabu) in 2011, this lack of structure has led to fissures in the group. The Christian Science Monitor explains :

There's now a growing divide between various partisans that claim the Anonymous moniker: The North American contingent is increasingly isolated by the rest of the community as Anonymous gains more traction in Europe, Asia, and Latin America.

This fissure, or lack of control over the movement, has been a few years in the making, but was most apparent after the Charlie Hebdo killings in Paris. In the wake of the January terrorist attack, European members of Anonymous pushed for online revenge attacks on Islamic militant website under the hashtag #OpCharlieHebdo....

Established North American Anonymous accounts ignored, criticized, or mocked #OpCharlieHebdo and #OpISIS.

Check out the Anonymous message to Israel below: