Russian hackers breached Dow Jones for trading tips

``Russian hackers had infiltrated Dow Jones & Co to steal information to trade on before it was made public, and the breach was "far more serious than a lower-grade intrusion" disclosed by the company, Bloomberg reported, citing sources... Dow Jones had said that there was unauthorized access to its systems at certain times between August 2012 and July 2015... The hackers sought information including stories being prepared for publication, Bloomberg said on Friday, citing two people familiar with the investigation.''