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"There was no immediate information on who was responsible," writes Reuters' Robert Mueller. "The hackers flooded the websites with digital requests, overwhelming their systems -- a common tactic known as a distributed denial of service attack. Campaign group the Committee to Protect Journalists said last month attacks on media organizations were on the rise and hackers were being hired to target reporters and websites by bodies trying to censor news outlets."
"Monday's attack probably came from Czech hackers, said Lucie Tvaruzkova, editor-in-chief at IHNED.cz, the website of the business daily Hospodarske Noviny," AFP reports. "'In the past, DDoS attacks were led from abroad so it was enough to block the server from foreign users. This time it seems to come from the Czech Republic,' she said on Facebook."