LONDON — U.K. medical professionals have issued an urgent plea to the British government to reimpose some Covid restrictions due to the increased level of infections and hospitalizations in the country.

Health leaders warned late Tuesday that the U.K. risks “stumbling into a winter crisis” if the government does not enact its “Plan B,” a pledge it made last month in which it said it would reimpose Covid measures if data suggested the National Health Service was “likely to come under unsustainable pressure.”

Officials at the NHS Confederation, which represents organizations across the U.K. healthcare sector, issued a statement calling on the government “to introduce measures, such as mandatory face coverings in crowded and enclosed spaces, without delay to keep people well and avoid the NHS from becoming overwhelmed this winter.”