NPR's coverage of the April 15 bombings that killed three people and wounded more than 250 is collected here.
Update at 11:47 a.m. ET. Suspects Are Said To Be Two Students And A Third Person; None Are Tamerlan Tsarnaev's Wife.
NPR's Dina Temple-Raston reports that law enforcement sources familiar with the situation say an indictment is expected to be unsealed later today that implicates three more individuals. Two of them, she's told, are students from Kazakhstan who were arrested over a week ago on immigration charges. They are going to be charged with obstruction of justice. Sources say they believe the two young men, who were students with Dzhokhar Tsarnaev at the University of Massashusetts' Dartmouth campus, may have helped him in some way after the attacks. The third person is an American citizen, Dina is being told, and is not Katherine Russell, Tamerlan Tsarnaev's wife.
The Boston Globe says the third person is also be a student. That has not been independently confirmed by NPR.
Dzhokhar Tsarnaev, 19, is in custody at a federal prison medical facility. His 26-year-old brother Tamerlan, the other main suspect in the bombings and crimes that followed, died from injuries he received during a gun battle with police on April 19.
Update at 11:42 a.m. ET. "No Threat To The Public."
Boston Police add this message in a new tweet: "Please be advised there is no threat to the public."