U.S. denounces Russia’s “dirty bomb” claim

Read MoreRussia’s general in charge of nuclear defense claimed that Ukraine is in the final stages of building a so-called dirty bomb and could use it against its own people. The U.S. dismissed Russia’s allegation as “transparently false.” Holly Williams has the latest.Russia’s general in charge of nuclear defense claimed that Ukraine is in the final stages of building a so-called dirty bomb and could use it against its own people. The U.S. dismissed Russia’s allegation as “transparently false.” Holly Williams has the latest.