A ring-wing Israeli group hacked into websites of organizations and activist groups Thursday, including those of the armed wing of Hamas, Izzadin Kassam, and left-wing Israeli organizations. The group of hackers, calling themselves the 'Extremist Zealots,' boasted that they had broken into numerous sites.

A screen shot from one of the hacked sites, featuring flags, and words to the 'Hatikva.'

Izzadin Kassam's site displayed a blank white screen and Hebrew text notifying of a technical error.

The websites of Arab Israeli political party Balad, and left-wing activist groups 'Hagada Hasmolanit' and 'Occupation' featured a black background with an Israeli flag, and the emblem of the 'Extremist Zealots' group, similar to that of Meir Kahane's Kach movement.

The lyrics from the Israeli national anthem 'Hatikva' were also posted on the sites in Hebrew, as well as pictures of Palestinian babies dressed as suicide bombers with the caption, 'Murderers from Birth.'

A short explanation, also in Hebrew, saying that the websites had been hacked into also appeared, however the sites all restored their original content within hours of being sabotaged.

A screen shot from one of the hacked websites.