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).
Sometimes—like when they call themselves "space conquerors" after launching a satellite that broke almost immediately and tumbled out of orbit—it can be hard to take North Korea seriously. Other times—like when they threaten another test of their nuclear program at a highly delicate time for their neighbors, politically—it seems wiser to keep a close eye on them.
The hunt for Osama bin Laden, a throwback gangster tale and a horror spoof all hit theaters this weekend, giving you a wide range of options.
'Zero Dark Thirty'
The story of the Navy SEAL team that killed Osama bin Laden, following years of work by a dedicated CIA operative, from the makers of 'The Hurt Locker
In the wake of the horrific killings at Sandy Hook Elementary School last week, Americans across the country are wondering how they can aid the families of the victims. There are numerous methods to donate money, but you also can help in other ways, such as volunteering your time, writing a card or letter, or sending a teddy bear to a child in Newtown.
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.
Here's a look at some notable birthdays being celebrated today:
Ozzy Osbourne Age: 64 Occupation: Singer Known For: Selling over 100 million albums worldwide both as a solo artist and a member of Black Sabbath, songs like 'Paranoid,' 'Iron Man' and 'Crazy Train,' an indecipherable and much-mocked mumble, and starring with his family in the reality show 'The Osbournes'
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