What happened and when in the search for the Boston Marathon bombers.
A timeline of events in the manhunt for the Boston Marathon Bombing suspects:
5:00 p.m. Thursday: The FBI reaches out to the public for help identifying two persons of interest in the Boston Marathon bombings. Images of the suspects are released.
10:00 p.m. Thursday: A 7/11 store near the MIT campus in Cambridge Massachusetts is held up.
Thursday around 10:30 p.m.: an MIT campus police officer is found shot dead in his vehicle near Vassar and Main Street. Authorities say he suffered several gunshot wounds. He was transported to Massachusetts General Hospital where he was pronounced dead.
Shortly after: Police respond to a carjacking by two males on Third Street in Cambridge. A victim was carjacked at gunpoint by the suspect. The suspects kept him in the car for at least a half hour before releasing him at a gas station on Memorial Drive in Cambridge. The victim was not injured.
Police pursued the car into Watertown during with the suspects threw bombs outside the car at police. During the chase police and the suspects exchange gun fire critically wounding one of the suspects.
One MBTA officer was seriously wounded. He has been identified as 33-years-old Richard H. Donahue Jr. He is currently at Massachusetts General Hospital.
Reports say at least one of the bombs found was similar to the pressure cooker bombs used at the marathon.
At 2 a.m. on Friday FBI released a photo of suspect 1 and suspect 2 online.
Friday 4 am: Boston and Cambridge Police confirm that the suspects in the MIT shooting and the chase in Watertown were the same suspects as those believed to be involved in that Boston Marathon bombings.
A short-time later the Middlesex County D.A. says suspect 1 is dead but suspect 2 has escaped and is at large.
A new image of suspect 2 from the convenience store robbery is released.
Around 6:45 a.m. Suspects identified as Russian nationals from Chechnya. They are believed to be brothers. Suspect 2 is identified as 19-year-old Djhokar Tsarnaez.
Around 7 a.m. Norfolk Ave in Cambridge is locked down. One of the two suspects was believed to have lived there.
8:00 a.m.: News briefing with FBI and Gov. Deval Patrick called.
Suspect 1 who was gunned down is identified as 26-year-old Tamerlan Tsarnaev.
People in Boston, Belmont, Newton, Cambridge, Waltham, Watertown, amd Allston/Brighton told to stay indoors with doors locked and not open the door for anyone aside from police officers.