- 12:55 a.m.
Around 1 a.m. Gunshots and explosions are heard in Watertown, just outside Boston. Dozens of police officers and FBI agents converge on a Watertown neighbourhood. A helicopter circles overhead.
- 2:40 a.m.
- 3:29 a.m.
Around 4:30 a.m. Massachusetts state and Boston police tell people living in eastern Watertown to stay in their homes.
- 6:04 a.m.
- 6:36 a.m.
Around 6:45 a.m. The Associated Press identifies one Boston bomb suspect as Dzhokhar A. Tsarnaev, 19, who has been living in Cambridge, Mass. The other, Tamerlan Tsarnaev, 26, was shot dead after a police shootout Thursday night.
- 7:31 a.m.
- 7:51 a.m.
- 8:07 a.m.
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, the other suspect's older brother.