Update, 4:21 p.m. Eastern: According to The Boston Globe, the FBI has said that the contents of the discarded backpack, allegedly thrown in the trash by Tsarnaev's friends, include: fireworks, jar of vaseline, and homework sheet. That's significant because, as CNN noted on air, vaseline can be used in making an explosive—you could see why Tsarnaev, or anyone under suspicion for explosive-making wouldn't want that, and fireworks, to be found in his/her possession.

Update, 3:57 p.m. Eastern: Phillipos, according to reports, was brought into court in handcuffs just after the other two friends were charged. Phillipos was read his Miranda rights, and will also be using a private attorney. His next hearing will be at 2 p.m. next Monday.

Phillipos is charged with lying to investigators during Boston Marathon Bombing investigation.Faces: 8 yrs in prison.$250k fine. #wbz — Karen Anderson (@karenreports) May 1, 2013

Update, 3:46 p.m. Eastern: It appears that Tazhayakov and Kadyrbayev will be waiving their rights to bail. The government was not seeking bail, telling the court that the two are flight risks. According to WCVB reporter Kelley Tuthill and WBZ-TV Karen Anderson, who were both inside the court room during a late afternoon bail hearing, both young men have private attorneys from out of state. The next court date will be May 14. We're awaiting statements from the lawyers.

Two criminal complaints (which you can read below) allege that the three suspects conspired to get rid of a backpack belonging to Tsarnaev, after learning that he was a suspect in the bombings, "in order to help his friend Tsarnaev avoid trouble." They later agreed to throw the backpack away. One of the men, Phillips, initially lied to investigators about removing the backpack, but all three have since admitted to their actions.

CBS News was the first to confirm the new break in the case shortly after 11:00 a.m. Eastern. Boston Police insisted there is no current threat to public safety.

Three additional suspects taken into custody in Marathon bombing case. Details to follow. — Boston Police Dept. (@Boston_Police) May 1, 2013

Jason Tuohey, an editor at The Boston Globe, reported that the three suspects are college students connected to Dzhokhar Tsarnaev through his school, UMass-Dartmouth, and CNN reports that they are in the custody of the FBI. CBS News also added that the three suspects will be charged crimes related to "harboring/aiding the bombing suspects after the fact" and there is no evidence that they had knowledge of the Boston Marathon attacks before they happened.

BREAKING: A source tells the Globe that the three were connected to Dzhokhar Tsarnaev at UMass Dartmouth and helped him after the fact. — The Boston Globe (@BostonGlobe) May 1, 2013

NBC's Pete Williams reported earlier that all three suspects were all roommates of Dzhokhar Tsarnaev, and may have removed items, possibly a backpack, from their dorm on his behalf. (According to the criminal complaint, only two of the suspects lived together, and none lived with Tsarnaev.) CNN's Susan Candiotti says the items removed from Tsarnaev's room included fireworks and a laptop. (Over the weekend, police searched a Boston-area landfill in search of a missing laptop and more explosives.) Two of the men were reportedly under surveillance by the FBI and immigration officials for several days, in part because they were believed to have violated the terms of their student visas.