— Around 5:50 a.m. authorities urge residents in Watertown, Newton, Waltham, Belmont, Cambridge, Arlington and the Allston-Brighton neighborhoods of Boston to stay indoors. All mass transit is shut down.
— Around 6:35 a.m., The Associated Press reports that the bomb suspects are from a Russian region near Chechnya and lived in the United States for at least a year.
— Around 6:45 a.m., The Associated Press identifies the surviving Boston bomb suspect as Dzhokhar A. Tsarnaev, 19, who has been living in Cambridge.
— Around 8 a.m., Boston’s police commissioner says all of Boston must stay in their homes as the search for the surviving suspect in the bombings continues.
— Around 8:40 a.m., a U.S. law enforcement official and the uncle of the suspects confirm that the name of the slain suspect is Tamerlan Tsarnaev, Dzhokhar Tsarnaev’s older brother.
— Around 10:20 a.m., Connecticut State Police say a gray Honda CRV believed to be linked to Dzhokhar Tsarnaev has been recovered in Boston.
— Around 10:35 a.m., the University of Massachusetts Dartmouth says it closed its campus and ordered an evacuation after confirming that Dzhokhar Tsarnaev is registered there. The school says it closed the campus “out of an abundance of caution” as the search continued.
— Around 11:30 a.m., Massachusetts State Police explain that the brothers suspected in the bombings were in the Honda CRV when they carjacked the Mercedes SUV. For a while, each drove one of the two vehicles, but then ditched the Honda and reunited in the Mercedes.
— Around 12:35 p.m., state police in Watertown say officers are searching door-to-door but still have not found the bombing suspect.