The World Health Organization (WHO) says weekly coronavirus cases in Europe have exceeded the numbers reported when the pandemic first peaked in March.
WHO regional director Hans Kluge on Thursday said 300,000 new infections were reported last week alone.
He described the situation as serious.
Some European countries, including the UK and France, have recorded their highest daily tallies in months.
Testing capacity has increased across Europe since the pandemic began, meaning that cases are now more likely to be identified and recorded.
But Mr. Kluge said the new figures also showed alarming rates of transmission across the region.