The original content of Democracy Now! Headlines appears under the Creative Commons BY-NC-ND 3.0 License (United States). For more, including their other shows and media, visit www.democracynow.org. May 31, 2013 U.S. Authorities Probe More Suspicious Letters Sent to Obama ------------------------------------------------------------- U.S. authorities are investigating more suspicious letters sent to President Obama that may contain the poison ricin. The Secret Service confirmed one of the letters was similar to the ones addressed to New York City Mayor Michael Bloomberg and the group Mayors Against Illegal Guns, which referenced the national push for gun control. A number of threatening letters have been sent to officials and government agencies in recent weeks. Three of them, including one addressed to Obama, were reportedly postmarked from Spokane, Washington, where a man was charged last week with sending ricin-tainted mail to a federal judge. .