CNN fired three employees for entering the office without being vaccinated, according to The New York Times.According to CEO Jeff Zucker, the network has a "zero tolerance policy" regarding unvaccinated individuals.Numerous news agencies now require COVID-19 vaccinations as a condition for employment.10 Things in Politics: Get the latest news in politics and economics Loading... Click Sign up to receive marketing emails and other offers from Insider.CNN fired three employees for violating company policy. They came into the office without being vaccinated against COVID-19 according to The New York Times' Michael Grynbaum report and The New York Times' Oliver Darcy report.Grynbaum & Darcy reported that CNN has a "zero tolerance policy" regarding employees not being vaccinated at work. They cited a memo from CEO Jeff Zucker."In the last week, we were made aware that three employees were not being vaccinated and they came to the office. All three employees have been fired. "Let me be clear, we have a zero tolerance policy on this," Darcy stated in a memo.The network is just one of many news organizations like The Washington Post, The New York Times and Politico that require employees to get vaccinated against COVID-19 before they can return to work.Insider reached out to CNN for comment but a representative did not immediately respond.Continue reading: The set of 'The Masked Singer' was hit with 12 COVIDs, but they won't stop filming. This is what the Delta variant could signify for other productions.According to Darcy, Zucker also announced that CNN would delay its mandated return to office on September 7, likely to be in mid-October, due to an increase of COVID-19 cases caused by the highly contagious Delta variant.Zucker wrote that he understood the feeling and said, "I think it's fair to say we all feel a mixture of anxiety, frustration, confusion and exasperation...I understand it."The increase in Delta variant infections has compelled many companies to rescind their mandates for masks and push back against COVID-19 vaccination.According to the Centers for Disease Control and Prevention, 70% of Americans aged 18 and over had received at least one dose COVID-19 vaccine. 60% of Americans are considered fully vaccinated as of Thursday.