Other governments, including the U.S. and U.K., are taking a more measured approach.
The U.K Foreign & Commonwealth Office advises against all nonessential travel to Tokyo and northeastern Japan. It urges British citizens in the country to observe Japanese authorities' advice, which includes a 20-kilometer (12.4-mile) exclusion zone around the Fukushima nuclear plant.
It said it is actively monitoring the situation.
U.S. Ambassador to Japan John Roos briefed reporters Wednesday night, saying American officials are carefully monitoring radiation levels.
"If we assess that the radiation poses a threat to public health, we will share that information and provide relevant guidance immediately," Roos said.
The Philippine Embassy in Tokyo told its citizens to follow advisories issued by Japanese authorities. It added, however, that Filipinos who are concerned about possible radiation exposure "may wish to voluntary relocate to areas further away, or depart voluntarily from the country using their own means."
If relocation and repatriation become necessary, the Philippine government will defray the costs involved, the Department of Foreign Affairs said in a statement.
An Indian software services company, L&T Infotech, on Wednesday ordered the temporary evacuation of 185 employees and their family members from Japan. It said in a release that it had chartered a special Kingfisher Airlines flight that will depart Friday to Chennai, India.
Cirque du Soleil has also decided to move its performers and staff working in Japan to Macau, said spokeswoman Chantal Cote in an e-mail. Its show "ZED" is based at Tokyo Disneyland, the touring "KOOZA" show was performing at the Fuji Dome in Tokyo.
Associated Press writers Rod McGuirk in Canberra, Australia, Erika Kinetz in Mumbai, Camille Rustici in Paris and Joe McDonald in Tokyo contributed to this report.