Obama in S. Korea: will confront N. Korea nuclear threat

The summit will bring together nuclear-armed nations, plus those with civilian nuclear energy plants and several seeking to build them. Several non-nuclear nations and international organizations, including the U.N. and the International Atomic Energy Agency, are attending.

Countries known or suspected to have nuclear weapons are the U.S., Russia, Britain, France, China, Israel, India, Pakistan and North Korea.

Scores of countries still have research reactors fueled by weapons-usable uranium, and medical devices that use radioactive materials that could be fashioned into a “dirty bomb” are scattered all over the world.

Copyright 2012 The Associated Press

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