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Following the cyber-attack by an alleged Saudi hacker who leaked thousands of Israelis' credit cards details last week, an Israeli hacker has posted information online about hundreds of Saudis, Egyptians, and Syrians.

The Yediot Ahronot daily reported that the hacker, who identifies himself as an Israeli soldier, posted the information on Pastebin late Tuesday.

"Dozens of Israeli sites are hacked every day anyway," he said. "I believe that the minute information becomes available it should be disclosed. We have reacted too feebly, in my opinion."

The retaliation came after a top Saudi banking official denied that Israeli hackers were on the verge of publishing account details of thousands of Saudi citizens and were threatening to release the information if hackers continued to publish Israeli credit card details online, Associated Press agency reported.

Saudi banks have raised their alert level in fear of Israel's revenge. 0xOmar, the hacker who claimed to have stolen and published the details of up to 400,000 active Israeli credit cards, defined himself as a Saudi Arabian from the hacking group Anonymous.

Israeli authorities admitted 15,000 accounts were hacked and an Israeli hacker said he traced the leaks to a 19-year-old man from the United Arab Emirates studying in Mexico.

Days later, a hacker claiming to be a 19-year-old Saudi national, using the pseudonym 0xOmar, posted credit card details and personal information of 6,000 thousand Israelis online and contended he had access to tens of thousands of other accounts.