Photo/Illutration Quarantine officers ask passengers arriving on a flight from Frankfurt to fill in a questionnaire at Narita Airport in Chiba Prefecture on March 21. (Tsubasa Setoguchi)

All visitors from the United States, China, South Korea and most of Europe will be refused entry to Japan under tougher restrictions to curtail new coronavirus infections, government sources said.

Currently, Japan has banned entry from some parts of China and South Korea, and 21 European countries. It has also required visitors from some parts of China and South Korea, as well as anywhere in the United States, to self-isolate at home or in hotels for two weeks after their arrival.

The Foreign Ministry was also expected to move March 30 to raise its travel advisory regarding infectious diseases to the second highest “Level 3” for these countries, advising people to suspend travel to those countries from Japan.

Parts of southeastern Asia and Africa are expected to be added to the entry ban and travel suspension advisory.

Once the new restrictions based on the Immigration Control Law take effect, foreign nationals who have stayed in the listed countries during the previous two weeks will be banned from entering Japan, unless there are exceptional circumstances.