U.N. nuclear agency says Iran agrees to address bomb probe issues

VIENNA (Reuters) - A long-stalled U.N. probe into suspected atomic bomb research by Iran took a potentially important step forward this week when Tehran agreed to address questions about explosives and other activity that the West says could help it build nuclear weapons.

The undertaking, hammered out in secretive talks in Tehran, could advance an investigation that the U.N. International Atomic Energy Agency is trying to conduct, and may also help Iran and six world powers to negotiate a broader deal to end a dispute that has raised fears of a new Middle East war.