A United States government-chartered plane is set to evacuate about three dozen US diplomats and their families from Wuhan, the epicenter of the coronavirus, on Tuesday.

But the plane may not fly to San Francisco as previously announced by the State Department, a US official with knowledge to the matter told CNN.

The flight, operated by a private charter company using a Boeing 767 with 240 seats, will land somewhere in California, the official said.

It’s unclear how many non-diplomat US citizens will be aboard the flight, which will be staffed with medical personnel.

The US consulate in Wuhan, which is now closed, reached out to Americans who had registered with them and offered seats on the plane. Non-diplomat US citizens will be billed for the flight, the official said.

The city is normally a transport hub for central China, but Chinese authorities have placed Wuhan under a travel lockdown, barring all departures from the city’s airport and rail stations.

A Chinese foreign ministry spokeswoman said on Sunday that after the US proposed to evacuate its citizens from the city, Beijing made arrangements, “that are consistent with our epidemic control measures” and provided “necessary assistance and convenience.”

Other nations, such as Australia and India, are working on ways to repatriate their citizens from Wuhan.