(An ambulance on Feb. 14, 2020, leaves Daikoku Pier in Yokohama where the cruise ship Diamond Princess remains in quarantine after a number of the 3,700 people on board were diagnosed with a new coronavirus.)

TOKYO - The U.S. government will send chartered aircraft to Japan to evacuate American citizens and their families from a coronavirus-hit cruise ship quarantined near Tokyo, its embassy said Saturday, amid concerns about deteriorating sanitary conditions on the vessel.