France to impose entry restrictions on travelers from Argentina, Chile, South Africa and Brazil, in hopes of keeping out especially contagious coronavirus variants, the government has announced.

The restrictions include mandatory 10-day quarantines with police checks to ensure people arriving in France observe the requirement. Travelers from all four countries will be restricted to French nationals and their families, EU citizens and others with a permanent home in France.

Under the new restrictions, travelers must provide an address for where they plan to observe the 10-day confinement period and police will make visits and fine those who are found in violation, the government said. Along with the mandatory quarantine, France is requiring more stringent testing for the coronavirus. Travelers must show proof of a negative PCR test taken less than 36 hours instead of 72 hours before they boarded a flight, or a negative antigen test less than 24 hours.

A Covid-19 variant first identified in England spread to continental Europe and is now responsible for about 80 percent of the virus cases in France, while the variants first seen in Brazil and South Africa make up less than 4% of French infections, Health Minister Olivier Veran said last week.