According to the World Health Organization's European director, declining transmissions in Europe suggest that coronavirus vaccines are protecting against new variants.

However, regional director Hans Kluge warned that the pandemic is still ongoing and that international travel should be avoided to avoid a resurgence.

Kluge told reporters in Copenhagen that new cases in Europe have dropped from 1.7 million in mid-April to about 685,000 last week, a 60 percent drop.

During the briefing, Kluge said, "This development is fragile."