U.S. conducted subcritical nuclear tests in Dec. and Feb.

U.S. conducted subcritical nuclear tests in Dec. and Feb.

WASHINGTON (Kyodo) -- The United States conducted subcritical nuclear tests at a Nevada underground test site on Dec. 1 last year and Feb. 2 this year, an arm of the Energy Department said Tuesday.

With the revelation by the National Nuclear Security Administration, the administration of President Barack Obama, who has called for creating a nuclear-free world, is likely to face criticism from antinuclear groups, including those in Japan.

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