Police in Florida have arrested a man who threatened to go on a shooting rampage in his local supermarket because he thought too few shoppers were wearing protective masks against the coronavirus.

Robert Kovner, 62, was arrested after he posted on Facebook that he would "empty every clip I own" in his local Publix supermarket because not enough customers were wearing protective face coverings, police said.

"Will it take shooting a few of you selfish A-holes in the parking lot to get the message through?" Kovner was reported to have posted on social media.

"Trust me, the virus is not the only thing that may cause your demise!"

Police in Sebring, some 85 miles (135 kilometers) south of Orlando, said that "these are stressful times, but there is no excuse for making threats like this."

A Florida man threatened a shooting at a local supermarket because not enough of the customers were wearing protective face coverings
The current nutritional fact labels that are found on the back of packaging have been in use since 1990. Three decades on, this system seems somewhat antiquated in comparison to the straightforward color-coded labeling used in countries such as the U.K. and France. AFP / Ina FASSBENDER

"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," they said.

Florida has some of the laxest gun laws in the United States, a country rife with mass shootings and where the right to possess guns is guaranteed by the constitution.

Gun shops have been listed as essential services during the pandemic and have racked up record sales since March.

Following federal guidelines, Florida recommends the use of masks in public spaces to prevent the spread of the disease, but face coverings are not obligatory outside of cities like Miami and Miami Beach, whose mayors have ordered them to be worn in enclosed spaces that are open to the public.

By Friday, Florida had recorded more than 24,000 cases of coronavirus, with 680 deaths.

Kovner was charged with threatening to carry out a mass shooting. A police spokesman told AFP he was released on $30,000 bail and that his weapons were confiscated.