By Ryan McNeill and M.B. Pell NEW YORK (Reuters) - At least 800,000 people across the United States live near hundreds of sites that store large amounts of potentially explosive ammonium nitrate, which investigators are blaming as the source of last month's deadly blast at a fertilizer plant in West, Texas, a Reuters analysis shows. Hundreds of schools, 20 hospitals and 13 churches, as well as hundreds of thousands of households, also sit near the sites. At least 12 ammonium-nitrate facilities have 10,000 or more people living within a mile. ...

SPOKANE, Wash. (AP) — A 37-year-old man was arrested Wednesday in connection with a case in which a pair of letters containing the deadly poison ricin were discovered in Washington state last week.