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Timeline: 26 Hours That Set Boston on Edge

  • This combination of photos provided on Friday, April 19, 2013 by the Federal Bureau of Investigation, left, and the Boston Regional Intelligence Center, right, shows a suspect that officials have identified as Dzhokhar Tsarnaev, being sought by police in connection with Monday's Boston Marathon bombings. (AP Photo/FBI, BRIC)

    This combination of photos provided on Friday, April 19, 2013 by the Federal Bureau of Investigation, left, and the Boston Regional Intelligence Center, right, shows a suspect that officials have identified as Dzhokhar Tsarnaev, being sought by police in connection with Monday's Boston Marathon bombings. (AP Photo/FBI, BRIC)

  • This combination of undated photos shows Tamerlan Tsarnaev, 26, left, and Dzhokhar Tsarnaev, 19. The FBI says the two brothers and suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left Tamerlan dead and Dzhokhar still at large on Friday, April 19, 2013. The ethnic Chechen brothers lived in Dagestan, which borders the Chechnya region in southern Russia. They lived near Boston and had been in the U.S. for about a decade, one of their uncles reported said. (AP Photo/The Lowell Sun & Robin Young)

    This combination of undated photos shows Tamerlan Tsarnaev, 26, left, and Dzhokhar Tsarnaev, 19. The FBI says the two brothers and suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left Tamerlan dead and Dzhokhar still at large on Friday, April 19, 2013. The ethnic Chechen brothers lived in Dagestan, which borders the Chechnya region in southern Russia. They lived near Boston and had been in the U.S. for about a decade, one of their uncles reported said. (AP Photo/The Lowell Sun & Robin Young)

  • This Monday, April 15, 2013 photo shows a man who was dubbed Suspect No. 2 in the Boston Marathon bombings by law enforcement, on the left side of the frame, wearing a white baseball cap, walking away from the scene of the explosions. The FBI identified him as 19-year-old college student Dzhokhar Tsarnaev, who along with his brother Tamerlan, 26, previously known as Suspect No. 1, killed an MIT police officer, severely wounded another lawman and hurled explosives at police in a car chase and gun battle during a night of violence, early Friday, April 19, 2013. Tamerlan Tsarnaev was killed overnight, officials said, while his brother Dzhokhar remains at large. (AP Photo/David Green)  EXCLUSIVE CONTENT-SPECIAL RATES APPLY FOR NON-AP MEMBERS AND  SUBSCRIBERS.

    This Monday, April 15, 2013 photo shows a man who was dubbed Suspect No. 2 in the Boston Marathon bombings by law enforcement, on the left side of the frame, wearing a white baseball cap, walking away from the scene of the explosions. The FBI identified him as 19-year-old college student Dzhokhar Tsarnaev, who along with his brother Tamerlan, 26, previously known as Suspect No. 1, killed an MIT police officer, severely wounded another lawman and hurled explosives at police in a car chase and gun battle during a night of violence, early Friday, April 19, 2013. Tamerlan Tsarnaev was killed overnight, officials said, while his brother Dzhokhar remains at large. (AP Photo/David Green) EXCLUSIVE CONTENT-SPECIAL RATES APPLY FOR NON-AP MEMBERS AND SUBSCRIBERS.

  • This Monday, April 15, 2013, shows a man who was dubbed Suspect No. 2 in the Boston Marathon bombings by law enforcement, in the upper center of the frame, wearing a white baseball cap, walking away from the scene of the explosions. The FBI identified him as 19-year-old college student Dzhokhar Tsarnaev, who along with his brother Tamerlan, 26, previously known as Suspect No. 1, killed an MIT police officer, severely wounded another lawman and hurled explosives at police in a car chase and gun battle during a night of violence, early Friday, April 19, 2013. Tamerlan Tsarnaev was killed overnight, officials said, while his brother Dzhokhar remains at large. (AP Photo/David Green)

    This Monday, April 15, 2013, shows a man who was dubbed Suspect No. 2 in the Boston Marathon bombings by law enforcement, in the upper center of the frame, wearing a white baseball cap, walking away from the scene of the explosions. The FBI identified him as 19-year-old college student Dzhokhar Tsarnaev, who along with his brother Tamerlan, 26, previously known as Suspect No. 1, killed an MIT police officer, severely wounded another lawman and hurled explosives at police in a car chase and gun battle during a night of violence, early Friday, April 19, 2013. Tamerlan Tsarnaev was killed overnight, officials said, while his brother Dzhokhar remains at large. (AP Photo/David Green)

  • This image from video shows Boston Marathon bombing victim Kevin White (left) sitting with his brother, Andrew White, on Wednesday evening, April 17, 2013 soon after Kevin White was released from Boston Medical Center, where he was treated for injuries he suffered in Monday's blast. Kevin White had just left a restaurant with his parents when the first of two bombs that hit the Boston Marathon exploded about 10 feet away. The force of the blast, he said Wednesday, was so strong that it slammed them to the ground, breaking some of his mother's bones and tearing his father's right foot so badly surgeons had to amputate it. (AP Photo/Rodrique Ngow)

    This image from video shows Boston Marathon bombing victim Kevin White (left) sitting with his brother, Andrew White, on Wednesday evening, April 17, 2013 soon after Kevin White was released from Boston Medical Center, where he was treated for injuries he suffered in Monday's blast. Kevin White had just left a restaurant with his parents when the first of two bombs that hit the Boston Marathon exploded about 10 feet away. The force of the blast, he said Wednesday, was so strong that it slammed them to the ground, breaking some of his mother's bones and tearing his father's right foot so badly surgeons had to amputate it. (AP Photo/Rodrique Ngow)

  • This photo released by the FBI early Friday April 19, 2013, shows what the FBI is calling the suspects together,  walking through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI)

    This photo released by the FBI early Friday April 19, 2013, shows what the FBI is calling the suspects together, walking through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI)

  • Police officers walk near a crime scene Friday, April 19, 2013, in Watertown, Mass. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday as thousands of officers swarmed the streets in a manhunt that all but paralyzed the Boston area. (AP Photo/Matt Rourke)

    Police officers walk near a crime scene Friday, April 19, 2013, in Watertown, Mass. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday as thousands of officers swarmed the streets in a manhunt that all but paralyzed the Boston area. (AP Photo/Matt Rourke)

  • This combination of photos provided on Friday, April 19, 2013 by the Federal Bureau of Investigation, left, and the Boston Regional Intelligence Center, right, shows a suspect that officials have identified as Dzhokhar Tsarnaev, being sought by police in connection with Monday's Boston Marathon bombings. (AP Photo/FBI, BRIC)
  • This combination of undated photos shows Tamerlan Tsarnaev, 26, left, and Dzhokhar Tsarnaev, 19. The FBI says the two brothers and suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left Tamerlan dead and Dzhokhar still at large on Friday, April 19, 2013. The ethnic Chechen brothers lived in Dagestan, which borders the Chechnya region in southern Russia. They lived near Boston and had been in the U.S. for about a decade, one of their uncles reported said. (AP Photo/The Lowell Sun & Robin Young)
  • This Monday, April 15, 2013 photo shows a man who was dubbed Suspect No. 2 in the Boston Marathon bombings by law enforcement, on the left side of the frame, wearing a white baseball cap, walking away from the scene of the explosions. The FBI identified him as 19-year-old college student Dzhokhar Tsarnaev, who along with his brother Tamerlan, 26, previously known as Suspect No. 1, killed an MIT police officer, severely wounded another lawman and hurled explosives at police in a car chase and gun battle during a night of violence, early Friday, April 19, 2013. Tamerlan Tsarnaev was killed overnight, officials said, while his brother Dzhokhar remains at large. (AP Photo/David Green)  EXCLUSIVE CONTENT-SPECIAL RATES APPLY FOR NON-AP MEMBERS AND  SUBSCRIBERS.
  • This Monday, April 15, 2013, shows a man who was dubbed Suspect No. 2 in the Boston Marathon bombings by law enforcement, in the upper center of the frame, wearing a white baseball cap, walking away from the scene of the explosions. The FBI identified him as 19-year-old college student Dzhokhar Tsarnaev, who along with his brother Tamerlan, 26, previously known as Suspect No. 1, killed an MIT police officer, severely wounded another lawman and hurled explosives at police in a car chase and gun battle during a night of violence, early Friday, April 19, 2013. Tamerlan Tsarnaev was killed overnight, officials said, while his brother Dzhokhar remains at large. (AP Photo/David Green)
  • This image from video shows Boston Marathon bombing victim Kevin White (left) sitting with his brother, Andrew White, on Wednesday evening, April 17, 2013 soon after Kevin White was released from Boston Medical Center, where he was treated for injuries he suffered in Monday's blast. Kevin White had just left a restaurant with his parents when the first of two bombs that hit the Boston Marathon exploded about 10 feet away. The force of the blast, he said Wednesday, was so strong that it slammed them to the ground, breaking some of his mother's bones and tearing his father's right foot so badly surgeons had to amputate it. (AP Photo/Rodrique Ngow)
  • This photo released by the FBI early Friday April 19, 2013, shows what the FBI is calling the suspects together,  walking through the crowd in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI)
  • Police officers walk near a crime scene Friday, April 19, 2013, in Watertown, Mass. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday as thousands of officers swarmed the streets in a manhunt that all but paralyzed the Boston area. (AP Photo/Matt Rourke)

Boston — Key moments related to the search for the Boston Marathon bombing suspects:

■ At 5:10 p.m. Thursday, investigators of the bombings release photographs and video of two suspects. They ask for the public’s help in identifying the men.

■ Around 10:20 p.m., shots are fired on the campus of the Massachusetts Institute of Technology in Cambridge, just outside Boston.

■ At 10:30 p.m., an MIT campus police officer who was responding to a disturbance is found shot multiple times in his vehicle, apparently in a confrontation with the Boston Marathon bombing suspects. He is later pronounced dead.

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

■ Police soon pursue the carjacked vehicle in Watertown, just west of Cambridge.

■ Some kind of explosive devices are thrown from the vehicle in an apparent attempt to stop police. The carjackers and police exchange gunfire. A transit police officer is seriously injured. One suspect, later identified as Suspect No. 1 in the marathon bombings, 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 neighborhood. A helicopter circles overhead.

■ Around 4:30 a.m., Massachusetts state and Boston police tell people living in that section of eastern Watertown to stay in their homes. They identify the carjackers as the same men suspected in the marathon bombings. Overnight, police also release a photograph of a man believed to be Suspect No. 2 wearing a gray hoodie-style sweatshirt. The image apparently is from surveillance video taken at a gas station.

■ 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.

■ 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 car believed to be linked to Dzhokhar Tsarnaev has been recovered in Boston. They initially call it a Honda CRV, but authorities later say it was a Honda Civic.

■ 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 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.

■ Around 6:30 p.m., Massachusetts Gov. Patrick Deval announces that mass transit is resuming and the “stay indoors” order is being lifted even though one suspect remains on the lam. State police say that suspect, Dzhokhar Tsarnaev, fled on foot and there is indication he has a vehicle. They believe he is still in the state because of his ties to the area.

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

■ Dzhokhar Tsarnaev is taken into custody by police at approximately 8:45 p.m.