UPDATE 6-About 350 U.S. evacuees from China land at California air base

Two planes carrying about 350 Americans out of Wuhan, China, arrived at a U.S. military base in California on Wednesday, in Washington's latest effort to bring its citizens home from the epicenter of the fast-spreading coronavirus outbreak. The travelers on the two State Department-chartered flights will be quarantined for 14 days, the U.S. Defense Department said.

The jets landed at Travis Air Force Base, about midway between San Francisco and Sacramento, and one continued on to Miramar Marine Corps Air Station in San Diego after refueling. The United States and other countries are seeking to evacuate their citizens from China, where the coronavirus outbreak has killed 490 people, most in and around Wuhan, and infected more than 23,000.

Twelve cases have been confirmed in the United States, the latest being reported in Wisconsin on Wednesday. The patient, who is isolated at home, traveled to Beijing and was exposed to known cases while in China, the state health department said. The evacuees at Travis will be housed in a hotel on the base, the base said in a statement on its Facebook page. As in other places, the U.S. Department of Health and Human Services will take charge of the care, transportation, and security of the evacuees.

"A safety cordon will be established, away from residential housing, to ensure the Travis mission can safely continue," the statement said. The Pentagon said it also preparing Camp Ashland, an Army National Guard base in Nebraska, to receive up to 75 people for quarantine.

In New Jersey, state Health Department officials said they quarantined an asymptomatic person who arrived at Newark Liberty International Airport on Tuesday after traveling to Hubei province, where Wuhan is located. The person will be monitored for symptoms for 14 days. Wednesday's flights were the second and third U.S. government flights taking people out of China. Nearly 200 Americans, mostly U.S. diplomats and their families, were flown to March Air Force Base east of Los Angeles on Jan. 29.

The Trump administration declared a public health emergency on Jan. 31 and announced the extraordinary measures of barring the entry of foreign nationals who have recently visited China and imposing a mandatory two-week quarantine for travelers from China's most affected province of Hubei. The State Department later issued a "Do Not Travel" to China advisory to U.S. citizens.