12:45 p.m. (EST): FBI spokesman Paul Bresson has confirmed that the substance found in the letter to the president was ricin.
The Secret Service says that a letter containing a suspicious substance and addressed to President Obama was received on Tuesday at a White House mail facility. This comes just after a letter sent to Senator Roger Wicker (R.-Miss.) was found to contain the poison ricin.
9 p.m. (EST): The final press conference of the day with Massachusetts Governor Deval Patrick, Boston Police Commissioner Ed Davis and various other officials just concluded. The FBI is now leading investigations of the events. Davis confirmed that three people were killed in today's blasts.
CNN is reporting that one of the victims killed was an 8-year-old boy. The Wall Street Journal had reported that as many as five other unexploded devices were found around Boston, but investigators now doubt that they were actually bombs.
On Tuesday, the Supreme Court heard oral arguments in Hollingsworth v. Perry, the case that is challenging the constitutionality of California's Proposition 8, which banned same-sex marriage. It is the first of two gay-marriage-related cases the court will hear this week; on Wednesday it will hear arguments in United States v. Windsor, a challenge to the constitutionality of the federal Defense of Marriage Act (DOMA).
Jorge Bergoglio, the 76-year-old archbishop of Buenos Aires, Argentina, has been elected as pope. He is the first Latin American to lead the Catholic Church. Bergoglio, who has taken the name Francis I, is also the first Jesuit priest to become pope.
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