Federal officials have opened a national security investigation into the recent $101 million hack of Bangladesh's central bank amid suspicions that North Korea was involved, law enforcement officials tell CNN. The probe, launched by the FBI and federal prosecutors in Los Angeles, echoes the suspicions of private cybersecurity firms that spoke with CNN in recent days. The massive digital heist of Bangladesh Bank and at least three other banks could pose a serious threat to the global banking system. U.S. investigators "aren't ready to attribute this to North Korea," one law enforcement official said. "There's a ... (full story)