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.
February is American Heart Month, and a number of celebrities have gotten in on the message—in particular, Allison Janney. Janney is now the spokesperson for Go Red for Women, a campaign by the American Heart Association aimed at spreading awareness that the number one killer of women (and men) is heart disease.
NOTE: This post will be continually updated as new information comes in. Video and photos are below. All times Eastern.
UPDATE 6:30 p.m.: Originally it was thought that Adam Lanza, the gunman, shot his mother at the Sandy Hook Elementary school, where she was a teacher's aide. ABC has learned that, in fact, Nancy Lanza was killed at her home (by her son) prior to the massacre. He then drove to the school, where he killed 20 children and six adults, before killing himself.
Do you see that one part of the map there in the lower-right corner that's not like the rest of the map? If you were of political age in 2000, this mostly red-and-blue map looks frighteningly familiar, but fear not: even though the phrase "Florida is still too close to call" may send shudders down many people's spines, this time around it won't matter much.
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