Nations throughout Europe and past started closing their borders to vacationers from the UK on Sunday, and the European Union arrange a disaster administration assembly, a day after Britain’s prime minister, Boris Johnson, ordered a wholesale lockdown on London and surrounding areas, citing considerations of a brand new fast-spreading variant of the coronavirus.

Practice stations in London on Saturday evening crammed with crowds of individuals scrambling to depart town to flee the brand new restrictions, which went into impact at midnight and successfully quarantined the capital and different areas from the remainder of the nation, the harshest measures to be taken because the nation’s first lockdown in March.

On Sunday, Britain’s well being secretary, Matt Hancock, known as those that packed trains “clearly irresponsible.” He additionally mentioned that the restrictions Mr. Johnson imposed could possibly be in place for months.

The primary wave of nations to bar vacationers from the UK have been in Europe. The Netherlands mentioned it would suspend flights from Britain from Sunday till Jan. 1, noting that the variant present in England was “ thought to unfold extra simply and extra rapidly.”

Italy additionally suspended air journey, and Belgian officers on Sunday enacted a 24-hour ban on arrivals from the UK by air or practice, which could possibly be prolonged. Germany and Switzerland introduced bans on journey between their international locations, and each Britain and South Africa, the place a similarly contagious version of the virus has emerged. Austria, Eire, France and Bulgaria additionally introduced bans. Portugal, which banned journey to and from the UK, is making exceptions for Portuguese nationals or residents.

In the US, Gov. Andrew M. Cuomo of New York urged the federal authorities to take motion, saying that “proper now, this variant within the U.Okay. is getting on a spot and flying to J.F.Okay.,” whereas additionally acknowledging that it might be too late. The State Division mentioned that its journey advisory to Britain has not been modified and stays at Degree 3.

Spain asked the European Union for a coordinated response, and senior officers from the bloc’s 27 member states met by video convention Sunday night to share their plans. They agreed to determine on any coordinated motion on the disaster administration assembly, to be held Monday morning.

Inside hours, extra international locations took motion. Iran suspended flights to Britain for 2 weeks, Reuters reported. Israel barred international arrivals not solely from the UK, according to The Times of Israel, but additionally from South Africa and Denmark, the place a coronavirus mutation that occurred in mink was transmitted again into the human inhabitants. Turkey briefly suspended flights from these three international locations, in addition to the Netherlands, Reuters mentioned.

Transport officers in England mentioned that they might improve the variety of cops monitoring hubs like railway stations to make sure solely important journeys have been being taken.

Viral mutations are usually not unusual, and British officers mentioned this variant had been detected in a handful of different international locations. The estimate of better transmissibility for the British variant is predicated on modeling and has not been confirmed by lab experiments, mentioned Muge Cevik, an infectious illness professional on the College of St. Andrews in Scotland and a scientific adviser to the British authorities.

“Over all, I believe we have to have a bit bit extra experimental knowledge,” she mentioned. “We are able to’t fully rule out the truth that a few of this transmissibility knowledge is likely to be associated to human habits.”

The virus disaster got here as one other down-to-the-wire drama was taking part in out for Britons: the trade negotiations between Britain and the European Union. Critics say the British prime minister’s penchant for last-minute selections has sophisticated the dealing with of the coronavirus and narrowed the window for scrutiny of any commerce take care of the E.U.

Dana Rubinstein and Raphael Minder contributed reporting.