Boston-area police say one marathon bombing suspect was shot and later died Friday morning during a wild car chase and shootout with police. His heavily armed younger brother, identified as Dzhokhar A. Tsarnaev, 19, of Russia, remained at large.
Connecticut State Police say a vehicle believed to be linked to Dzhokhar has been recovered.Police said the gray Honda CRV with Massachusetts plates was found in Boston. It was empty. It is currently being processed for evidence.
ABC News reported that Dzhokhar Tsarnaev is believed to have assault rifles and an assortment of other weapons, including bombs. Officials are concerned he might try to take hostages, ABC News reported.
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Police initially warned residents of Watertown, Massachusetts to stay indoors and not answer the door unless instructed by uniformed police officers. However, that request was extended to the entire Boston area at 6 a.m. MT.
A massive number of SWAT officers and Boston police officers are going through the Watertown neighborhood where they believe Suspect 2 is holed up and are searching for him. They are looking through back yards, front yards, and in some cases, going inside homes, hunting for him.
Massachusetts State Police tweeted that officers would be going door-to-door and street-by-street in Watertown. They said officers would be clearly identified.
Authorities have established a 20-block perimeter in Watertown as they search for Dzhokhar Tsarnaev, the Globe reported. CNN is reporting an estimated 100 state and local police officers are involved in the search. Some FBI agents are also at the scene.
Dzhokhar Tsarnaev is considered to fit the description of Suspect 2, the bombing suspect wearing a white cap in photos released by the FBI Thursday . He has brown, curly hair and was wearing a gray hoodie in a surveillance photograph tweeted by the Boston Police Department.
"We believe this to be a terrorist. We believe this to be a man who's come here to kill people," said Ed Davis, Boston's Police Commissioner.
The brothers' uncle, Ruslan Tsarni, told The Associated Press that the brothers lived together near Boston and have been in the United States for about a decade. They traveled here together from the Russian region near Chechnya.
-- Overnight events --
Authorities suspected the chaotic night of violence began with the robbery of a 7-Eleven in Cambridge. Then, at about 10:20 p.m. ET, a Massachusetts Institute of Technology campus police officer was repeatedly shot and found in his patrol car. The officer, later identified by the university as Sean Collier, 26, was pronounced dead at a hospital and police said two male suspects were believed to be responsible.
As dozens of local and state police spread across Cambridge, searching for the killers, two men reportedly carjacked a black Mercedes SUV.
The carjacked driver was kept inside that SUV, the Middlesex District Attorney said, for about a half hour before being released at a gas station.
Somewhere in the Watertown area, the vehicle was spotted and a police pursuit began. Gunfire was exchanged and police said explosives were thrown from the SUV during the firefight.
During that shootout, a transit officer was shot. Richard H. Donohue, Jr., 33, has worked as a transit officer for three years. He is in critical condition at a Boston area hospital.
The man believed to be Suspect 1 was also shot, and later died at Beth Israel Deaconess hospital. Doctors there described him as arriving in a state of "dramatic arrest" and having a combination of blast and gunshot wounds.
Watertown residents reported the sounds of explosions and automatic gunfire. Some tweeted photos of bullet holes in their homes.