Alphabet Inc’s Google told its employees they would either be fired or lose pay if they do not follow its COVID-19 vaccination rules, CNBC reported on Tuesday, citing internal documents.

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A memo circulated by Google’s leadership said employees had until December 3 to declare their vaccination status and upload documentation showing proof, or to apply for a medical or religious exemption, according to the report.

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After that date, Google allegedly said it would start contacting employees who had not uploaded their status or were unvaccinated and those whose exemption requests were not approved.

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CNBC reported that employees who have not complied with the vaccination rules by January 18 will be placed on “paid administrative leave” for 30 days, followed by “unpaid personal leave” for up to six months and termination.

However, Google did not immediately respond to a Reuters request for comment.

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Recently, Google delayed its return-to-office plan indefinitely amid the ongoing omicron variant fears and some resistance from its employees to company-mandated vaccinations. It earlier expected staff to return to office for about three days a week from January 10.