NASCAR and IndyCar have each called off their races this weekend.

NASCAR was scheduled to run Sunday at Atlanta Motor Speedway without spectators but said Friday it is calling off this weekend and next week’s race at Homestead-Miami Speedway.

IndyCar was scheduled to open its season Sunday on the streets of St. Petersburg, Florida, but suspended it’s season through the end of April. Four races are affected.

The cancellations were the latest of a plethora of U.S. and international sports cancellations announced this week in an attempt to slow the spread of the coronavirus.