(CNN.com) — President Obama hosts leaders from 46 countries for a two-day nuclear security summit starting Monday that will focus on how to better safeguard weapons materials, both old and new, to keep them out of the hands of terrorists.
The gathering at the Walter E. Washington Convention Center in the nation’s capital is considered an unprecedented effort to rally global action on securing vulnerable nuclear materials.
It also is the centerpiece of a major Obama objective aimed at preventing the spread of nuclear weapons and technology.
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