Eight new lawsuits have been filed over the loss of more than 4,000 frozen eggs and embryos at an Ohio hospital nearly a year ago.

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The new lawsuits against University Hospitals and CAS DataLoggers add to the more than 70 lawsuits already filed against the hospital system, NBC News reported.

The frozen eggs and embryos were lost March 4, 2018, when a malfunction caused the temperature to rise in a cryo storage tank. The problem went undetected because a remote alarm system had been turned off.

After the incident, University Hospitals Fertility Center sent letters of apology to the nearly 1,000 affected patients, NBC News reported.

“We don’t know who turned off the remote alarm nor do we know how long it was off,” the letter stated,” the letter stated.

The new lawsuits claim that CAS DataLoggers was responsible for monitoring the remote alarm, NBC News reported.

In a statement released Thursday, University Hospitals said the fertility center had apologized to the affected patients and offered them free fertility care.

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