Danish health officials have urged soccer fans who attended the European Championship game between Denmark and Belgium on June 17 in Copenhagen to be checked for the coronavirus after they found at least three people who later tested positive for the delta variant.
The Danish health minister says about 4,000 people sat near those who have tested positive.
Denmark has reported 247 cases of the variant since April 2.
All those attending the final Euro 2020 game in Copenhagen on Monday must show valid documents that they are not infected with COVID-19 before they can enter Parken Stadium.