The type of attack, known as DDo S, crashes websites and services by overwhelming them with large amounts of traffic.
Such attacks are usually mounted using computers that were previously infected with a virus.
We ask supporters to stop taking down the US internet. In 2010, banks and other firms cut ties with Wikileaks after it published the leaked Bradley Manning files and a 2007 video of a U. apache helicopter mistakenly shooting several Iraqi civilians.
Anonymous hackers attacked the firms in response, crippling their online operations.
Below we summarise some of the key activities of UK surveillance agencies exposed by Edward Snowden.