The broad coronavirus restrictions imposed affected those in the UK and France.
The British government is limiting gatherings and France is set to enforce new curbs for major cities on Friday.
Governments across the continent have been battling a recent uptick of Covid-19 cases.
More than 943,000 people have now died from Covid-19 since it first emerged in China late last year, according to an AFP tally, with Europe accounting for more than 200,000.
WHO regional director for Europe Hans Kluge said a surge seen this month "should serve as a wake-up call" after the continent recorded 54,000 infections in a single day last week — a new record.
"Although the numbers reflect more comprehensive testing, it also shows alarming rates of transmission across the region," Kluge told an online news conference from Copenhagen.
The Spanish capital of Madrid said it had been overwhelmed by the virus and called for "decisive" action from the central government, which is set to unveil a raft of new restrictions Friday.
Madrid officials warned that the region's healthcare system was coming under increasing pressure, with one in five hospital beds occupied by coronavirus patients amid a second wave of the illness.