In a recent post on popular microblogging site Twitter, the Anonymous hacktivists - in collaboration with Turkish and other hackers - have claimed the responsibility of the cyber attack on Israel's Mossad spy agency.

The hacking of Mossad - in a direct denial-of-service attack - led the hacktivists to release the names, addresses and contact numbers of more than 35,000 Israeli officials, including politicians, army officers and Mossad's spy agents.

The spreadsheets with personal data of the Israeli officials were posted online on Friday by the `Red Hack' Turkish Internet group which operates as an affiliate of the Anonymous hacking outfit. In a separate hack, another online hacker group, Sektor 404, attacked the Mossad website and caused its temporary shut down.

The hack launched against the Mossad spy agency is the latest cyber attack in a series of actions under the `#OpIsrael' banner. In their threat to "remove Israel from cyber space," the members as well as affiliates of the Anonymous hacking group have planned in a major action scheduled for April 7.

The ongoing `#OpIsrael' campaign marks the Anonymous hactivists' self-declared cyberwar against Israel; with the campaign having been launched by the hacking outfit in response to Israel's eight-day assault on Gaza which resulted in the killing of 177 Palestinians in November last year.