No Travel Warnings or Alerts Currently in Effect for Japan
The May 2013 American Citizen Services Newsletter from the U.S. Embassy in Tokyo indicates that no travel warning or alert currently exists for Japan.
On February 19th, 2013, the Department of State issued a Worldwide Caution to update information on the continuing threat of terrorist actions and violence against U.S. citizens and interests throughout the world. See: http://travel.state.gov/travel/cis_pa_tw/pa/pa_4787.html
For additional information, please visit "Americans Traveling Abroad" on the Department of State website: http://www.travel.state.gov/visa/americans/americans_1252.html
Students traveling abroad may wish to visit: http://studentsabroad.state.gov/