A Florida man was arrested after authorities say he threatened a mass shooting at a grocery store because not enough people were wearing masks during the coronavirus outbreak.

Robert Kovner, 62, was arrested Tuesday following a post he wrote on social media that authorities viewed as a threat, the Highlands County Sheriff’s Office said on Facebook.

"The writer was upset that not enough people, in his opinion, are wearing masks when they are out and about," the sheriff's office wrote.

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Wearing masks or other face coverings in public places has been recommended by U.S. health officials, while some local authorities have made it a requirement for people to wear masks in public, including in areas of South Florida.

"We realize these are stressful times, but there is no excuse for making threats like this," the sheriff's office wrote on Facebook. "It's not a joke. It's not just a bad day. It's a crime. We will ALWAYS take them seriously and you will go to jail."

Kovner faces felony charges of making a threat of a mass shooting and his bond has been placed at $30,000, according to the Miami Herald.

The coronavirus has struck Florida significantly in the past weeks, with the number of cases rising to more than 21,000 and over 500 reported deaths as of Wednesday.