BOSTON - USA Today - The city and its suburbs remain in lockdown Friday afternoon as a massive manhunt combs the area for the teenaged surviving suspect in the Boston Marathon bombings.
Authorities are focusing a house-to-house sweep in Watertown for Dzhokhar Tsarnaev, 19, the brother of Tamerlan Tsarnaev, 26, who died following a dramatic early Friday morning shootout with police.
Police say Dzhokhar is armed and fear he is wearing an explosive vest. Authorities no longer believe there are other accomplices. The official, who is not authorized to comment publicly, said investigators have been running down leads on possible associates of the suspect bombers, all of which have produced no other suspects.
During the overnight and early-morning pursuit of the suspects, the official said authorities recovered a handful of improvised explosive devices (IEDs), including one in the possession of Tamerlan Tsarnaev. All of the devices appeared to be homemade "fused'' explosives.
Police took Tamerlan Tsarnaev to Beth Israel Deaconess Medical Center following the gunfight with police at about 1:20 a.m. Friday. Dr. David Schoenfeld said medical personnel tried to revive him. He had multiple gunshot wounds and burn and gaping blast wounds that appeared to have come from an explosive device strapped to his body.
The brothers' acts continue to befuddle authorities, family and friends that know them. Students at the University of Massachusetts Dartmouth, where Dzhokar was a student, say they saw him on campus following Monday's bombings.
lnvestigators have not found any formal links so far to an international terror group.
Dzhokar's escape prompted Massachusetts Gov. Deval Patrick to order the city of Boston and its surrounding suburbs locked down and its residents to remain in their homes. The Boston Red Sox and Bruins postponed Friday night games. Businesses in Watertown, Newton, Waltham, Belmont, Cambridge and the Alston and Brighton neighborhoods of Boston were requested to remain closed and residents to remain indoors until the suspect is caught. Massachusetts shut down all mass transit, including buses and trains, in Boston and surrounding suburbs, Kurt Schwartz, director of Massachusetts Emergency Management Agency said.
The Tsarnaev family is believed to have moved to the USA in 2003. They had lived in Kazakhstan for several years after fleeing war-torn Chechnya. Tamerlan attended Bunker Hill Community College in nearby Charlestown as a part-time student for three semesters from 2006 to 2008. He studied accounting.
In an telephone interview from Russian with the Associated Press, the brothers' father, Anzor Tsarnaev, said Dzhokhar is "a true angel" and "an intelligent boy." In subsequent media interviews, he said his sons had been framed for Monday's bombings.
Ruslan Tsarni, an uncle who had not spoken to his brother's sons since December 2005, urged Dzhokhar to turn himself in to authorities. Meeting with reporters Friday outside his home in Montgomery County, MD., Tsani said he believed the brothers may have been recently "radicalized." Tsarni says he was unaware of any military or weapons training they may have received. Tsarni called the brothers "losers" and said they had brought his family shame.
Their names were not known to law enforcement officials before the bombings, which killed three people and wounded 176. Authorities are reviewing the brothers' possible ties to Chechnya - an area of Russia plagued by Islamic insurgency - a law enforcement official who is not authorized to comment publicly told USA TODAY.
Dzhokhar Tsarnaev is believed to have dropped a backpack laden with explosives at the site of Monday's second explosion. He was pictured wearing a white baseball cap in video images released by the FBI Thursday. His page on the Russian social networking site Vkontakte says he attended Cambridge Rindge and Latin School, graduating in 2011, the year he won a $2,500 college scholarship from the city of Cambridge. On the website, his world view is described as "Islam" and he says his personal goal is "career and money."
Larry Aaronson, a neighbor and retired history teacher at Cambridge Rindge and Latin School, got to know Dzhokhar while taking photos of the high school wrestling team and other school activities.
"It's completely out of his character," Aaronson said of Dzhokhar's alleged role in the bombings. "Everything about him was wonderful. He was completely outgoing, very engaged, he loved the school. He was grateful not to be in Chechnya."
Dzhokhar was not overtly political or religious, Aaronson says. "He spoke and acted like any other high school kid."
Boston Police Commissioner Ed Davis made the announcement that the entire city should stay indoors at a news conference where Gov. Deval Patrick said the remaining suspect, described as a dangerous terrorist, was still on the loose.
The developments came after the suspects killed an MIT police officer overnight, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt, authorities said as the manhunt intensified.
The suspects were identified to The Associated Press as coming from the Russian region near Chechnya, which has been plagued by an Islamic insurgency stemming from separatist wars. A law enforcement intelligence bulletin obtained by the AP identified the surviving bomb suspect as Dzhokhar A. Tsarnaev, a 19-year-old who had been living in Cambridge, just outside Boston, and said he "may be armed and dangerous."
Two law enforcement officials told the AP that Tsarnaev and the other suspect, who was not immediately identified, had been living legally in the U.S. for at least one year.
In Boston, authorities suspended all mass transit and urged people to stay indoors as they searched for the remaining suspect, a man seen wearing a white baseball cap on surveillance footage from Monday's deadly bombing at the marathon finish line.
"We believe this man to be a terrorist," said Boston Police Commissioner Ed Davis. "We believe this to be a man who's come here to kill people."
Authorities urged residents in Watertown, Newton, Arlington, Waltham, Belmont, Cambridge and the Allston-Brighton neighborhoods of Boston to stay indoors. At least a quarter of a million people live in those suburbs. All mass transit was shut down, and businesses were asked not to open Friday. People waiting at bus and subway stops were told to go home.
The shutdown came hours after the killing of one suspect, known as the man in the black hat from marathon surveillance footage.
All modes of public transportation were shut down, including buses, subways, trolleys, commuter rail and boats, said Joe Pesaturo, spokesman for the Massachusetts Bay Transportation Authority.
The White House said President Barack Obama was being briefed on developments overnight by Lisa Monaco, his assistant for homeland security and counterterrorism.
The suspects' clashes with police began only a few hours after the FBI released photos and videos of the two young men, who were seen carrying backpacks as they mingled among marathon revelers. The bombings on Monday killed three people and wounded more than 180 others, and authorities revealed the images to enlist the public's help finding the suspects.
The images released by the FBI depict two young men, each wearing a baseball cap, walking one behind the other near the finish line. Richard DesLauriers, FBI agent in charge in Boston, said the suspect in the white hat was seen setting down a bag at the site of the second of two deadly explosions.
Authorities said surveillance tape recorded late Thursday showed the suspect known for the white hat during a robbery of a convenience store in Cambridge, near the campus of MIT, where a university police officer was killed while responding to a report of a disturbance, said State Police Col Timothy Alben. The officer died of multiple gunshot wounds.
From there, authorities say, the two men carjacked a man in a Mercedes-Benz, keeping him with them in the car for half an hour before releasing him at a gas station in Cambridge. The man was not injured.
The search for the vehicle led to a chase that ended in Watertown, where authorities said the suspects threw explosive devices from the car and exchanged gunfire with police. A transit police officer was seriously injured during the chase, authorities said.
In Watertown, witnesses reported hearing 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.
Watertown resident Christine Yajko said she was awakened at about 1:30 a.m. by a loud noise, began to walk to her kitchen and heard gunfire.
"I heard the explosion, so I stepped back from that area, then I went back out and heard a second one," she said. "It was very loud. It shook the house a little."
She said a police officer later knocked on her door and told her there was an undetonated improvised explosive device in the street and warned her to stay away from the windows.
"It was on the street, right near our kitchen window," she said.
Yajko said she never saw the suspect who was on the loose and didn't realize the violence was related to the marathon bombings until she turned on the TV and began watching what was happening outside her side door.
State police spokesman David Procopio said, "The incident in Watertown did involve what we believe to be explosive devices possibly, potentially, being used against the police officers."
Boston cab driver Imran Saif said he was standing on a street corner at a police barricade across from a diner when he heard an explosion.
"I heard a loud boom and then a rapid succession of pop, pop, pop," he said. "It sounded like automatic weapons. And then I heard the second explosion."
He said he could smell something burning and advanced to check it out but area residents at their windows yelled at him, "Hey, it's gunfire! Don't go that way!"
Doctors at a Boston hospital where a suspect in the marathon bombings was taken and later died are saying they treated a man with a possible blast injury and multiple gunshot wounds.
MIT said right after the 10:30 p.m. shooting that police were sweeping the campus in Cambridge and urged people to remain indoors. They urged people urged to stay away from the Stata Center, a mixed-use building with faculty offices, classrooms and a common area.
The suspects' images were released hours after President Barack Obama and first lady Michelle Obama attended an interfaith service in Boston to remember the dead and the wounded.
At the Cathedral of the Holy Cross, Obama saluted the resolve of the people of Boston and mocked the bombers as "these small, stunted individuals who would destroy instead of build and think somehow that makes them important."
"We will find you," he warned.
In the past, insurgents from Chechnya and neighboring restive provinces in the Caucasus have been involved in terror attacks in Moscow and other places in Russia.
Those raids included a raid in Moscow in October 2002 in which a group of Chechen militants took 800 people hostage and held them for two days before special forces stormed the building, killing all 41 Chechen hostage-takers. Also killed were 129 hostages, mostly from effects of narcotic gas Russian forces used to subdue the attackers.
Chechen insurgents also launched a 2004 hostage-taking raid in the southern Russian town of Beslan, where they took hundreds of hostages. The siege ended in a bloodbath two days later, with more than 330 people, about half of them children, killed.
Insurgents from Chechnya and other regions also have launched a long series of bombings in Moscow and other cities in Russia. An explosion at the international arrivals hall at Moscow's Domodedovo airport in January 2011 killed at least 31 people and wounded more than 140.
___ Sullivan reported from Washington. Associated Press writer Pat Eaton-Robb contributed to this report from Boston.