Hackers have targeted the office website of Israeli prime minister Benjamin Netanyahu's office with a Distributed Denial of Service attack (DDoS), according to local reports.
Information security experts said that thousands of computers attacked the website at the same time, attempting to overload it with requests and forcing it offline.
"There was a communications problem that lasted for a few minutes and was corrected immediately," a Prime Minister's Office spokesman said.
Other websites of large Israeli institutions and businesses were also attacked on Tuesday, according to Haaretz.
The Anonymous hacker collective has threatened its own cyber-crusade against Israel to end what it claims is Tel Aviv's reign of terror. In the latest round of cyber-warfare between pro-Palestinian and pro-Israeli hackers, the hacktivists released a video on YouTube accusing Israel of committing crimes against humanity.
The Saudi hacker 0XOmaar, who has been at the forefront of the Arab cyberwar against Israel, again targeted Tel Aviv and leaked stolen data from the country's Ministry of Construction and Housing.
0xOmar, who is allegedly a 19-year-old Saudi hacker, started targeting Israel in early January, when he claimed to have stolen and posted details of 400,000 credit cards online. Israeli authorities admitted that 15,000 accounts had been compromised.