UPDATE 2:25 p.m. EST: The suspects' names are Azamat Tazhayakov, Dias Kadyrbayev and Robel Phillipos. From The Boston Globe:
Azamat Tazhayakov and Dias Kadyrbayev, both 19 and of New Bedford, were charged with conspiracy to obstruct justice by plotting to dispose of a laptop computer and a backpack containing fireworks belonging to bombing suspect Dzhokhar Tsarnaev, the US attorney’s office said in a statement.
Robel Phillipos, 19, of Cambridge was charged with making false statements to law enforcement officials in a terorism investigation, prosecutors said.
12:10 p.m. EST: According to Boston.com, the three suspects went to school at UMass-Dartmouth with Dzhokar Tsarnaev and may have helped him in the days immediately following the bombing, which was on April 15. Two of the suspects have been charged with overstaying their student visas.
The Boston Police Department announced that it has taken into custody three new suspects as a result of its ongoing investigation into the Boston Marathon bombing.
Get ready to throw away all those ratty old Benjamins that are just laying around your house—the newly designed $100 bill will be going into circulation in October.
The FBI's website crashed almost immediately after the press conference began, with so many people trying to get a look at the images.
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.