Massive data breach may have been discovered due to 'unforced error' by suspected Russian hackers
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US officials and private sector experts investigating the massive data breach that has rocked Washington increasingly believe the attackers were ultimately discovered because they took a more aggressive "calculated risk" that led to a possible "unforced error" as they tried to expand their access within the network they had penetrated months earlier without detection, according to a US official and two sources familiar with the situation.