9 a.m., April 16, 2013 -- A heavy police presence remains in Boston as the city remains on heightened alert.
10 a.m. -- Boston officials update victims numbers to three dead, 176 injured, 17 critical.
11:30 a.m. -- President Barack Obama gives a second statement, calling the bombings an "act of terror."
5:10 p.m., April 18, 2013 -- The FBI releases photos and videos of two suspects investigators believe are behind the bombing.
10:30 p.m. -- An MIT campus police officer was found shot in his vehicle in the area of Vassar and Main Streets after a convenience store robbery. He was transported to Massachusetts General Hospital and pronounced dead.
Early morning hours, April 19, 2013 -- The two suspects allegedly hijacked a car at gunpoint in Cambridge, Massachusetts, taking the driver as a hostage, then releasing the hostage. Officers began to chase, the suspects threw explosives and fired shots at the officers. Officers fired back, striking and killing a man, who was later identified as one of the bombers, Tamerlan Tsarnaev, 26. Another policeman, transit officer Richard H. Donohue Jr., was also shot, but survived.
Early hours -- Dozens of police and FBI rush into the Watertown, Massachusetts, area. Police order residents in Watertown to turn off their cell phones and they complete door-to-door searches for the living suspect. Schools and public transportation are shut down and Boston Police Commissioner Ed Davis ordered everyone in the Boston Metro area to stay indoors as the manhunt for the second suspect continued.
8 a.m. -- Sources identify the dead suspect as Tamerlan Tsarnaev, 26, and the suspect on the run as his brother Dzhokhar Tsarnaev, 19, seen here.
8 a.m.: Boston-area residents are asked by authorities to stay inside as the hunt continues for Dzhokhar Tsarnaev.
9 a.m.: The slain suspect, Tamerlan Tsarnaev, was wearing explosives and an explosive trigger when his body was recovered, a source briefed on the investigation tells CNN.
11:30 a.m.: The uncle of the Tsarnaev brothers tells reporters that he is "ashamed" to be related to the suspects. He calls those responsible for the bombings "losers." Speaking outside his Maryland home, Ruslan Tsarni says his nephew Dzhokhar Tsarnaev "has put a shame on our family, a shame on the entire ethnicity" and should turn himself in.
6 p.m.: The lockdown for the Boston area is lifted, meaning people can again leave their homes, even though a suspect remains at large. The area's public transit system, known as the T, also returns to service after being shut down most of the day.
8:15 p.m.: A person believed to be Dzhokar Tsarnaev is cornered on a boat in a yard in Watertown, law enforcement officials say.
8:46 p.m.: The Boston Police Department tweets: "Suspect in custody. Officers sweeping the area. Stand by for further info."
8:46 p.m. Police in Watertown break out in cheers, shouting "Yay!" A crowd of neighbors also cheers.
9 p.m.: A law enforcement vehicle drives by the crowd and someone asks if they have the suspect. Another police officer says, "Yes," and the crowd of residents erupts in cheers again.
10:15 a.m. May 1, 2013: Three additional suspects are taken into custody. Two of them are students from New Bedford, Mass. They are arrested on charges of making false statements to investigators and conspiracy to obstruct justice. A third student also arrested is a U.S. citizen.
3:30 p.m. July 10, 2013: In his first court appearance since the April 15 bombings, Dzhokhar Tsarnaev pleaded not guilty to 30 federal counts related to attacks.
Jan. 5, 2015: Jury selection begins in Dzhokhar Tsarnaev's trial. Federal prosecutors and defense attorneys for Tsarnaev have held talks on a possible plea agreement that would spare him a potential death sentence but failed to reach one, U.S. officials familiar with the talks say.
March 3: With jury selection finally completed, opening arguments in Tsarnaev's trial begin.
The Madison Fire Department said a fire forced two people to jump from a second-story balcony and a 2-year-old was dropped into the waiting arms of a resident on the ground level. Eleven people were displaced due to the blaze. Click or tap for story.