Europe has seen an increase in weekly cases of Covid-19 for the first time in months as restrictions imposed to curb the spread of the virus are eased, the World Health Organization (WHO) says.
In 11 countries, which have not been named, accelerated transmission has led to "very significant" resurgences, said Regional Director Dr Hans Henri Kluge.
His warnings about the risk of resurgence had become reality, he said.
If left unchecked, he warned health systems would be "pushed to the brink".