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1:10 p.m. (EST): A third letter, this one sent to Senator Joe Manchin (D.-W.V.), has been found to contain ricin.

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.

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A heart-wrenching photo of 8-year-old Martin Richard, who was killed in the Boston Marathon bombing on Monday, shows the boy holding a hand-drawn sign that says, "No more hurting people. Peace."

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Three people were killed and more than 100 injured on Monday afternoon when two explosions went off near the finish line of the Boston Marathon. Rescue organizations have gathered to help and at the the tragic scene, but how can you help?

The Huffington Post has put together a helpful list of ways:

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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.

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Margaret Smith is one tough cookie.

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Dividing up a prom based on race is not a black-and-white issue at Georgia’s Wilcox County High School.

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Yes, you may have a job at the moment, but maybe you should looking for something new.

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A butter knife is causing some major controversy in Attleboro, Massachusetts.

Yes, a butter knife.

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There are about a million reasons why Jennifer Maldonado has the best coworkers in the world.

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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).

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