• Authorities found that almost half of the staple grain in one of the country's largest cities was contaminated with a toxic metal.

    LAST UPDATE : May 21, 2013, 2:24 PM EDT
  • President Barack Obama, accompanied by, from left, Vice President Joe Biden, Homeland Security Secretary Janet Napolitano and FEMA Deputy Administrator Richard Serino. talks about the Oklahoma tornado and severe weather, Tuesday, May 21, 2013, in the State Dining Room of the White House in Washington. (AP Photo/Pablo Martinez Monsivais)

    The president declared a major disaster in Oklahoma, ordering federal aid to supplement state and local recovery efforts.

    LAST UPDATE : May 21, 2013, 11:37 AM EDT