All times EDT
5:10 p.m. FBI releases photos and videos of suspects in the Boston Marathon bombings.
Sometime around 10 p.m. A video camera in a Cambridge convenience store captures one of the suspects.
10:20 p.m. Reports of shots fired on the MIT campus.
10:30 p.m. MIT police Officer Sean Collier, 26, of Somerville, Mass., is found shot in his cruiser at Main and Vassar streets. He is rushed to Massachusetts General Hospital, where he is pronounced dead.
11:30 p.m. Suspects carjack a Mercedes SUV at gunpoint.
12 a.m. The car’s owner is released at a gas station. SUV heads toward Watertown. Police give chase. Suspects throw explosive devices at police from the car.
12:45-1 a.m. Gunfire breaks out between suspects and police in Watertown. Transit Authority police Officer Richard H. Donohue is shot and wounded.
About 1 a.m. Suspect No. 1, later identified as Tamerlan Tsarnaev, 26, is brought to Beth Israel Deaconess Medical Center with multiple traumatic wounds. Massive manhunt begins for Suspect No. 2.
1:35 a.m. Suspect No. 1 pronounced dead.
2 a.m. FBI releases new photos of Suspect No. 2, later identified as Dzhokhar A. Tsarnaev, 19.
4:30 a.m. Police confirm Suspects No. 1 and No. 2 are Boston Marathon bombing suspects, advise area residents to stay in their homes.
5:30 a.m. Massachusetts Gov. Deval Patrick suspends all public transit service.
8 a.m. Patrick urges Boston residents to stay indoors.
8:30 a.m. FAA closes airspace over Watertown.
6 p.m. Police ease lockdown of Watertown, tell residents they can go outside. Resident sees blood near boat, tells police.
7 p.m. Gunshots heard on Franklin Street in Watertown.
8 p.m. Police set off flash-bang grenades.
8:45 p.m. Police announce suspect is captured.