The hacking group Anonymous took down several Vatican websites on Wednesday, saying it was targeting the "corrupt" Catholic Church, a day after a high-profile bust of the group's alleged leaders.
The five computer hackers charged in New York on Tuesday and a sixth who pleaded guilty are accused of involvement in some of the most notorious hacking incidents of the past 18 months.
People identifying themselves as activists in the Anonymous hacker movement said Wednesday it wasn't technical prowess but police infiltration that yielded 25 arrests in a sweep in Europe and South America.
Anonymous defended WikiLeaks when it was facing a funding cutoff, but the release of the Stratfor emails appears to be the first direct collaboration between the hackers and the anti-secrecy site.
Hacker group Anonymous strongly rejected suggestions on Tuesday that followers could cause a power outage by staging a cyberattack on an electricity grid.
Cybersecurity experts urged senators Thursday to close loopholes in legislation to give the government more power to force critical industries to make their computer networks more secure.
US senators, warning of potentially catastrophic cyberattacks, introduced a bill Tuesday aimed at protecting critical infrastructure such as power, water and transportation systems.
Hackers have targeted the public websites of the operators of the Nasdaq and Bats stock exchanges over the past two days with cyberattacks that disrupted the sites but had no impact on trading.
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.