The US is preparing to advise Americans not to travel abroad due to the coronavirus pandemic.

According to a report by Politico, the State Department is set to announce a Level 4 travel advisory applying to all international travel, its most severe warning, three individuals with knowledge of the pending announcement said.

Just last week the advisory was raised globally to Level 3: Reconsider Travel "due to the global impact of COVID-19."

The advisory would instruct all Americans abroad to either return to the United States or prepare to shelter in place, given the global threat of the coronavirus outbreak. Americans also would be instructed not to travel abroad.

The highly unusual guidance is set to come after seven weeks of steadily increasing restrictions on U.S. travel, following President Donald Trump's move to limit travel from China at the end of January. Other countries have closed their borders and imposed further travel restrictions as the virus has spread beyond Asia to Europe and the Western Hemisphere.

There are more than 10,000 confirmed coronavirus cases in the United States, across all 50 states and Washington, D.C. The World Health Organization on Thursday said that there are more than 191,000 confirmed cases across more than 150 countries.

Source: Politico.com