How a manhunt unfolded over 2 days

Key moments related to the search for the Boston Marathon bombing suspects.

At 5:10 p.m. Thursday, investigators release photos and video of two suspects and ask for the public’s help in identifying them.

Around 10:20 p.m., shots are fired on the campus of the Massachusetts Institute of Technology.

At 10:30 p.m., an MIT campus police officer who was responding to a disturbance is found shot multiple times in his vehicle. He is later pronounced dead.

Shortly afterward, two armed men carjack a Mercedes SUV in Cambridge. A man who was in the vehicle is held for about a half hour and released unharmed at a gas station in Cambridge.

Police soon pursue the carjacked vehicle in Watertown.

Explosive devices are thrown from the vehicle in an apparent attempt to stop police. The carjackers and police exchange gunfire. A police officer is seriously injured. One suspect is critically injured and later pronounced dead. Authorities launch a manhunt for the other suspect.

Around 1 a.m. Friday, gunshots and explosions are heard in Watertown. Dozens of police officers and FBI agents converge on a Watertown neighbourhood.

Around 4:30 a.m., police tell people living in that neighbourhood to stay in their homes. They identify the carjackers as the same men suspected in the bombings. Overnight, police also release a photograph of one of the suspects. The image apparently was taken from surveillance video at a gas station in Cambridge. Authorities initially say the suspects robbed the store but later say they did not.

Around 5:50 a.m. authorities urge residents throughout the Boston area to stay indoors. All mass transit is shut down.

Around 6:45 a.m., The Associated Press identifies the surviving Boston bomb suspect as Dzhokhar 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 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’s older brother.

Around 10:20 a.m., Connecticut State Police say a grey Honda Civic believed to be linked to Dzhokhar 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 Dzhokhar is registered there.

Around 11:30 a.m., police explain that the brothers were in the Honda Civic 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., police in Watertown say officers are searching door-to-door but have not found the suspect.

Around 6:30, Massachusetts Gov. Patrick Deval announces that mass transit is resuming and the “stay indoors” order is being lifted. Police say he fled on foot and there are no indications he has a vehicle. They believe he is still in the state.

Around the time the order is lifted, a flurry of gunfire breaks out in the community that was being searched. Officials locate Dzhokhar Tsarnaev in a boat parked behind a home.

At approximately 8:45 p.m., Dzhokhar Tsarnaev is taken into custody by police.