Washington (CNN) The State Department is recommending US citizens who remain in China take precautionary measures, including "stocking up on food," in the face of the Wuhan coronavirus outbreak that has spread worldwide.

Last week the US raised its travel advisory for China its highest level -- Level 4: Do Not Travel -- and continues to urge citizens to "attempt to depart by commercial means." However, for those remaining in the country, the State Department is suggesting steps like avoiding crowds and stockpiling foods.

"We strongly urge U.S. citizens remaining in China to stay home as much as possible and limit contact with others, including large gatherings. Consider stocking up on food and other supplies to limit movement outside the home," a security alert posted by US Mission China on Monday notes.

"In the event that the situation deteriorates further, the ability of the U.S. Embassy and Consulates to provide assistance to U.S. nationals within China may be limited," it says.

Tens of millions of people are on lockdown in Chinese cities, including in the Hubei province, where the virus originated. The State Department ordered non-emergency personnel and their families to leave the provincial capital city of Wuhan. They were among the approximately 200 Americans who were transported back to the US on a chartered flight arranged by the State Department last week.

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