U.S. health officials issued a travel warning Tuesday against China for an outbreak for the deadly coronavirus.

“On January 27, the Centers for Disease Control and Prevention (CDC) issued updated travel guidance for China, recommending that travelers avoid all nonessential travel to all of the country (Level 3 Travel Health Notice),” the CDC said in a statement.

It said the warning is in response to an ongoing outbreak of the novel coronavirus spreading between people in many parts of China, adding the Chinese health officials have reported thousands of coronavirus cases, as well as severe illness including deaths.

Read more: US health officials: Avoid nonessential travel to China