Two more hospitals in Southern California were attacked by hackers using ransomware, a software program that encrypts and locks data on a computer.
Servers were disrupted last week at Chino Valley Medical Center in Chino and Desert Valley Hospital in Victorville, both owned by Prime Healthcare Services.
Last month, Hollywood Presbyterian Medical Center in Los Angeles paid about $17,000 in bitcoins, a cryptocurrency, to hackers who disabled its computer network in similar attack.
The hospitals continued operating with no danger to patients nor any breach of patient or employee data, Fred Ortega, a spokesman for Prime Healthcare, told the Associated Press.
Computer security experts say hospitals are particularly vulnerable to hackers because of old software that is required to run some medical equipment.
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