2:45 p.m. (EST): The Boston Police Department has announced that "there has not been an arrest in the Marathon attack." Investigations are ongoing.
2:35 p.m.: CNN is retracting their previous report that an arrest has been made in the Boston Marathon bombings. Other sources are reporting that officials are close to identifying a suspect after reviewing area surveillance video, but no arrests have been made.
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.
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.
Tuesday evening, a plume of black smoke rose out of the Sistine Chapel at the Vatican, signifying that the first round of balloting to elect a new pope had passed without any nominee receiving the necessary two-thirds majority.
Going on right now in Big Bear, California, is a gunfight between law-enforcement officials and alleged cop-killer Christopher Dorner. Multiple officers have apparently been injured during the battle, in which hundreds of rounds have been fired.
New to theaters this week: a cops-and-corruption thriller, Ah-nuld's return to his roots and a freaky-looking horror piece about—what else?—creepy kids. A little light on the comedy and family fare, perhaps, but an intriguing mix nonetheless.
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.
UPDATE 11:20: The networks have announced that Barack Obama will be reelected to a second term, after wrapping up the state of Ohio.
The 2012 presidential election between Barack Obama and Mitt Romney will finally conclude tonight, as voters head to their local polls to choose who gets to sleep in the White House on January 20, 2013. We'll be following all the results very closely, adding the latest news as states close their polls and announce their winners.
Watch this post for updated information—election results, Senate races, ballot measures, battleground-state news—throughout the night:
A man drove from Long Island, New York, into Lower Manhattan earlier today in a van he thought was filled with explosives. He parked the van close to the Federal Reserve building, just a few blocks from the World Trade Center, and planned to detonate it using a cell phone from a nearby hotel.
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