WATCH: Crazy Shootout in Watertown Mass
WATCH: Watertown Witness Describes Violent Scene
BREAKING NEWS: 9:40am
a SWAT team and armored car had been summoned and police were surrounding a home and a car near an intersection in Watertown, the community that officials said is the focus of their search.
“They’re pointed across the street. Guns are pointed across the street. There have been hundreds of cops here throughout the day,” said Natalie, a resident of Willow Park, who declined to give her last name.
BREAKING NEWS: 8:33am
A man named Ruslan Tsarni, identified as the uncle of the brothers who are suspected of the Marathon bombings, is being interviewed by phone by the station. He said the news that his nephews -- the sons of his older brother -- was absolutely shocking to his family.
"I am wordless. I am wordless. I am wordless. Shocked. I've been watching it, reading it. People who did this do not deserve to exist on this earth. That's what I think." - Man identified as the uncle of the brothers suspected of the Marathon bombings. "I have not been in touch with them for a number of years -- perhaps 2009 last time."
The suspects are brothers with the last name Tsarnaev, law enforcement officials told NBC News. The suspect on the loose is Dzhokhar A. Tsarnaev, 19 and has a Massachusetts driver’s license, they said. Law enforcement officials told NBC News that both men had international ties, had been in the United States about a year and had military experience.
One of two suspects in the Boston Marathon bombing is dead, the other on the loose and large parts of the city are on virtual lockdown after a chaotic night of mayhem that included the murder of a Massachusetts Institute of Technology police officer and a shootout with police, authorities said early Friday.
The two men believed to be the suspects from Monday's terror attack apparently surfaced just hours after the FBI released their imaged late Thursday afternoon, shooting the police officer, robbing a convenience store, carjacking a man who later escaped and engaging in a wild shootout with Boston police, in which they hurled explosives from their stolen car.
Boston Police Commissioner Ed Davis said on Twitter that one of the two suspects was killed and that the at-large suspect, labeled by the FBI as "suspect two" in the marathon bombing, was "armed and dangerous."
Authorities urged residents in Watertown, Newton, Waltham, Belmont, Cambridge and the Allston-Brighton neighborhoods of Boston to stay indoors. All mass transit was shut down.
"We believe this to be a terrorist," Davis said in a press conference. "We believe this to be a man who's come here to kill people. We need to get him in custody."
The Middlesex district attorney said the two men are suspected of killing the MIT police officer on campus late Thursday, then stealing a car at gunpoint and later releasing its driver unharmed. Hours earlier, police had released photos of the marathon bombing suspects and asked for the public's help finding them.
The suspects threw explosives from the car as police followed it into Watertown, according to the district attorney's news release. The suspects and police exchanged gunfire, and one of the suspects was critically injured and later died while the other escaped.
During the pursuit, a MBTA transit police officer was seriously injured and transported to the hospital, the news release states. Details on the officer's condition were not immediately available Friday morning.
Hours earlier, police had released photos of the marathon bombing suspects and asked for the public's help finding them. A new photo of the suspect on the loose was released later showing him in a grey hoodie sweatshirt. It was taken at a 7-Eleven in Cambridge, just across the Charles River from Boston.
A federal law enforcement official told Fox News they are looking into whether the bombing suspects may have been from overseas and had overseas military training.
Dozens of officers and National Guard members descended on Watertown shortly after the shooting outside a building on MIT's campus in Cambridge, according to the Associated Press.
Authorities were calling for somebody to get on the ground and put their hands up and a loud thud was heard after someone shouted "fire in the hole," the news agency reported.
Witnesses told The Associated Press they heard multiple gunshots and explosions at about 1 a.m. Friday. Dozens of police officers and FBI agents were in the neighborhood and a helicopter circled overhead.
State police spokesman David Procopio told news agency, "The incident in Watertown did involve what we believe to be explosive devices possibly, potentially, being used against the police officers."
Doctors at Beth Israel Deaconess Medical Center in Boston where a suspect in the marathon bombings was taken and later died said they treated a man with a possible blast injury and multiple gunshot wounds. They wouldn't say if the patient they treated, who came in with police, was the suspect in the black hat from marathon surveillance footage.
Earlier Friday, Cambridge police and the Middlesex District Attorney's office said the MIT officer was responding to a report of a disturbance when he was shot multiple times late Thursday. He later died at a hospital. His name was not immediately released.
Procopio said the shooting took place about 10:30 p.m. outside an MIT building. The area was cordoned off and surrounded by responding law enforcement agencies, according to a posting on the university's website.
The shooting came little more than three days after the twin bombings on the Boston Marathon that killed three people, wounded more than 180 others and led to an increase in security across the city.