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Search firm remains silent on how its ad servers infected thousands of European computers.
As many as two million European users of Yahoo may have received PC malware from virus-laden ads served by its homepage over a four-day period last week.
Some of the malware would turn PCs into bitcoin miners - a huge drain on its computing resources - without users' knowledge. Yahoo has been criticised for not saying how many people could be affected or doing anything to help those with the malware, which attacked flaws in Java modules on systems.
