The NFL has issued fines amounting to over $1 million to teams and head coaches for breaking with the league’s coronavirus protocols last week after three coaches were spotted without masks on the sidelines.

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ESPN’s Adam Schefter broke the story late Monday reporting that Denver’s Vic Fangio, Seattle’s Pete Carroll and San Francisco’s Kyle Shanahan were all hit with $100,000 fines. Schefter cited unnamed sources who said their teams were also hit with $250,000 fines. In all, the league issued $1.05 million in fines, he tweeted.

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A league source confirmed the report to Fox News.

Health experts have stressed the importance of wearing a mask to limit the possibility of infecting others with COVID-19. States have implemented policies to make face coverings mandatory in both indoor and outdoor spaces.

CBS Sports reported that the league’s executive vice president of football operations sent a memo reminding teams of the need to wear masks during games.

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"Failure to adhere to this requirement will result in accountability measures being imposed against offending individuals and/or clubs ... Becoming careless or ignoring face covering and physical distancing requirements will put the 2020 season at risk," the memo from Troy Vincent said, according to the report.