British police arrested five people and the FBI launched raids across the U.S. as part of a probe into cyber attacks by online group "Anonymous", which last year assailed websites hostile to WikiLeaks.
In a series of dawn raids in England on Thursday, three teenage males and two adult men were arrested on suspicion of breaking the Computer Misuse Act 1990, London's Metropolitan Police Service (MPS) said.
On the same day, the FBI executed more than 40 search warrants throughout the United States.
London police said in a statement that "five males aged 15, 16, 19, 20 and 26 are being held after a series of coordinated arrests at residential addresses."
It added: "The arrests are in relation to recent and ongoing 'distributed denial of service' attacks (DDoS) by an online group calling themselves 'Anonymous'.
"They are part of an ongoing MPS investigation into Anonymous which began last year following criminal allegations of DDoS attacks by the group against several companies.
"This investigation is being carried out in conjunction with international law enforcement agencies in Europe and the U.S."
The FBI added in a statement that "Anonymous", a loose-knit group of computer hackers, had targeted "major U.S. companies across several industries."
Last year, "Anonymous" members launched assaults on the Amazon, Visa and Mastercard websites in apparent retaliation for the companies' decision to stop working with whistle-blowing website WikiLeaks.
WikiLeaks is under political pressure in the United States for its publication of thousands of classified U.S. diplomatic cables, which has enraged Washington.
In a typical DDoS attack, a large number of computers are commanded to simultaneously visit a website, overwhelming its servers, slowing service or knocking it offline completely.
The FBI said the attacks were aided by software tools which the group made available for free on the Internet.
Under British law, it is a criminal offence to carry out "any unauthorized act in relation to a computer", punishable by up to ten years in jail and a fine of £5,000 (5,800 Euros, $8,000).
"Anonymous" attacked Tunisian government websites this month and on Wednesday warned the Egyptian government of reprisals if it blocks Internet access for protesters.
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