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Hospital giant Community Health Systems said on Monday that the personal information of nearly 4.5 million patients was stolen by hackers in an attack believed to originate from China.

In a filing with the U.S. Securities and Exchange Commission, the company, which operates 206 hospitals in 29 states, reported that the hackers used “sophisticated malware” to attack the company’s security systems and copy and transfer hospital data.

The company used cybersecurity firm Mandiant to investigate the incident which it believes occurred in April and June.