Hacker Hannibal, who leaked thousands of Arab users' Facebook passwords earlier this year, recently published a file which he claims contains the e-mail addresses, passwords, user IDs and security questions and answers of approximately a million American users.

The hacker says the leak is in response to Anonymous' OpIsrael compaign of cyber attacks on Israeli sites.

"Lately Anonymous Group attacked for no reason Israeli websites and stuff," Hannibal wrote in a Pastebin post, according to Cyber War News. "Do you want to play with me, Anonymous Group? Do you have forgotten that Israel stands alongside the world's best hacker -- Hannibal ??? ... Today because the games did Anonymous Group, Americans will receive my punishment."

"The leaked file has been uploaded to various file sharing sites and is a 25.4MB RAR file which contains a text file named Punished_By_Hannibal.txt which is 134 MB and contains 6,766,984 lines," Cyber War News reports.

"The curious thing is that many of the accounts don’t seem to belong to Americans," writes Softpedia's Eduard Kovacs. "Instead, they appear to be registered by users from Spain, the Netherlands, Poland, France, Japan and, in some cases even Israel."

What's more, E Hacking News' Sabari Selvan suggests that the data may not be new. "After searching in Google, we found a pastebin post titled 'HANNIBAL Fraud,'" Selvan writes. "According to the post, the hacker Hannibal [stole] the dox collected by some other hacker. A file called 'EuroDB.txt' [was] uploaded [to the] site installgentoo[dot]net/~aaron/EuroDB.txt on October 9th ... before the major cyber attacks."