The "Anonymous" hacking group on Tuesday claimed to have shut down the website of security firm Combined Systems, which it accused of providing the tear gas used in crackdowns on protests.
The website of the Central Intelligence Agency was briefly inaccessible on Friday after the hacker group Anonymous claimed to have knocked it offline.
(AP) -- A group of Internet hackers said Wednesday it took down the website of the Banco do Brasil, Brazil's largest state-run bank. It's the third such attack against financial institutions in a week.
Lithuania's central bank said Friday it had been hit by a cyber-attack, but had eventually overcome the assault on its website and other online services.
The computer hacker group Anonymous attacked websites of Brazil's federal district Saturday as well as one belonging to a Brazilian singer to protest the forced closure of Megaupload.com.
Anonymous, which briefly knocked the FBI and Justice Department websites offline in retaliation for the US shutdown of file-sharing site Megaupload, is a shadowy group of international hackers with no central hierarchy.
The websites of Israeli national carrier El Al and the Tel Aviv Stock Exchange (TASE) were both offline on Monday morning, hours after they were reportedly threatened by a Saudi hacker.
South Korea's military has raised its alert against potential cyber-attacks from North Korea after the death of leader Kim Jong-Il, the defence ministry said Tuesday.
A 24-year-old man allegedly linked to the Anonymous "hacktivist" group was arrested Tuesday over a cyber attack on a website run by the frontman of heavy rock group Kiss, the FBI said.
Websites which revealed violations in Russia's legislative polls were inaccessible Sunday after a hacking attack their operators said was aimed at preventing the exposure of mass election fraud.