The United Kingdom will close all travel corridors from 4.00 a.m. local time Monday, UK Prime Minister Boris Johnson announced Friday.

Speaking at a news conference, Johnson stressed the only way to get into the country is by having a negative coronavirus test result.

"This means that if you come to this country, you must have proof of a negative Covid test that you've taken in the 72 hours before leaving. And you must have filled in your passenger locator form, and your airline will ask for proof of both before you take off," Johnson said.

"You may also be checked when you land and face substantial fines for refusing to comply, and upon arrival, you must then quarantine for 10 days, not leaving your home for any reason at all. Or take another test on day five and wait for proof of another negative result and we will be stepping up our enforcement, both at the border and in the country," Johnson added.

Boris Johnson said the new rules would be in place until at least 15 February.

All travel corridors will close from 04:00 GMT on Monday. After that, arrivals to the UK will need to quarantine for up to 10 days, unless they test negative after five days.

England is currently under a national lockdown, meaning people must stay at home and can go out only for limited reasons such as food shopping, exercise, or work if they cannot do so from home.