One of the suspects in the Boston Marathon bombing is dead, the other is on the loose, and we've got all of Friday's latest developments in the story, including the identities of the two Russian brothers believed responsible for the deadly attack.
1. Search For The Suspects
The two suspects in the bombing were identified after they fatally shot a Massachusetts Institute of Technology police officer at around 10:30 p.m. ET Thursday, robbed a 7-11, and carjacked a person riding in a Mercedes SUV. (The carjacking victim -- who was not hurt -- said the men boasted being responsible for the bombing, ABC News reported.) The incidents came hours after the FBI released photos of the suspects, which went viral in short time, in essence forcing them to flee the area.
Police killed one of the suspects in a gun battle, but the other one escaped and remains at large. Officials are warning citizens in six Boston neighborhoods (Watertown, Newton, Waltham, Belmont, Cambridge and the Allston-Brighton) to remain indoors.
Boston Police Commissioner Ed David said the man at large is "believed to be a terrorist.
"We believe this to be a man who's come here to kill people," David said. "We need to get him in custody."
A second officer -- with the transportation authority -- was also shot in the gun battle with the suspects and is in serious condition at a local hospital.
2. Suspects Identified
The man at-large has been identified by the Associated Press, NBC News and The Boston Globe as Dzhokhar A. Tsarnaev, 19, of Cambridge, Mass. The dead man has been identified as Tamerlan Tsarnaev, 26.
The AP reported that a source told them the men, believed to be brothers with para-military training, are natives of the Russia region near Chechnya, and have lived in U.S. for at least a year.
3. Man Down
Police said one of the suspects died during a battle with officers in Watertown, Mass., in which they tossed explosives at authorities.
"The incident in Watertown did involve what we believe to be explosive devices possibly, potentially, being used against the police officers," State police spokesman David Procopio said.
The man was taken to Boston's Beth Israel Deaconess Medical Center with multiple gunshot wounds and an injury possibly the result of his own explosives.
President Barack Obama and first lady Michelle Thursday attended a "Healing Our City" memorial service for the three victims who died in Monday's blasts (Martin Richard, Krystle Campbell and Lu Lingzi) at a Roman Catholic cathedral in the city.
There, he said of the terrorist attack: "If they sought to intimidate us, to terrorize us ... It should be pretty clear right now that they picked the wrong city to do it … we may be momentarily knocked off our feet, but we'll pick ourselves up. We'll keep going. We will finish the race."
6. City Shut Down
As police search for the suspects, all roads and highways adjacent to the area have been closed. Local businesses will not be permitted to open as of early Friday, and classes at educational institutions including Harvard, MIT, Emerson and others have been canceled for Friday.
An ABC television producer in town to cover the story -- and carrying a backpack -- had guns pulled on her and was brought in for questioning, illustrating the tension in the city at the manhunt continues.
7. It Keeps You Running
Organizers of Run to Remember, a 13-mile Memorial Day weekend race in Boston, said that more than 600 people have registered to run in the race since Monday's tragedy, with a total of 7,280 runners in all slated to participate.
Mayor Thomas M. Menino "made it clear he doesn’t want events canceling," Run to Remember's Steve Balfour said. "He wants to show that Boston is strong and moving forward.”
“The amazing thing was that in the first 48 hours after the blasts, there was a spike in registration of over 600 people -- normally, it would be about 135 to 140 registrations during that time.”
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Balfour said many of the runners who signed up also participated in Monday's race, before it abruptly ended in the wake of the bombings.
Keep checking back with RadarOnline.com for the latest details in this developing story…