(CNN) — Countries around the world have imposed sweeping travel bans and advisories to stem the spread of coronavirus within their borders and beyond.

President Donald Trump said Friday that non-essential travel across the US-Mexico border will be restricted.

The US State Department on Thursday raised its global travel warning to the highest level – Level 4: Do Not Travel, advising citizens to avoid all international travel.

"In countries where commercial departure options remain available, US citizens who live in the United States should arrange for immediate return to the United States, unless they are prepared to remain abroad for an indefinite period," the advisory warns.

Canada and the US will close their border to non-essential travel, US President Donald Trump confirmed on Twitter Wednesday.

Non-essential travel to the European Union has been banned for 30 days, the European Council announced Tuesday. Repatriation of EU citizens, "where necessary and possible," will also be arranged, the council said.

The United Kingdom's Foreign Office has advised against all non-essential international travel for 30 days because travelers "now face widespread international border restrictions and lockdowns in various countries," UK Foreign Secretary Dominic Raab said on Tuesday.

President Trump on Monday advised Americans to avoid groups of more than 10, to stay away from bars and restaurants and to avoid discretionary travel.

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