By Kevin Johnson, Donna Leinwand Leger and Gary Strauss, USA TODAY

Police cornered and captured Boston Marathon bombing suspect Dzhokhar Tsarnaev Friday night.

The Boston Police Department tweeted they had arrested the 19-year-old at about 8:45 p.m.

Tsarnaev'sarrest came two hours after Massachusetts Gov. Deval Patrick ended aBoston-area lockdown early Friday evening after a massive, day-longsearch of suburban Watertown, which seemingly failed to flush out theteenager.

At about 7 p.m., gunshots erupted in a Watertownresidential neighborhood, with Tsarnaev founed in a covered, traileredboat parked along the side of a two story, clapboard home on FranklinStreet. He may have been wounded in a early Friday morning firefightwith police that killed older brother Tamerlan Tsarnaev - was sitting upin the boat.

Police may have been tipped off by a resident whosaw blood on the boat, climbed up a ladder to open the tarp cover, andsaw a man. Hundreds of police on the scene surrounded the area, but wereapproaching the boat with caution because Tsarnaev is believed to bewearing or holding explosive devices.

For most of the day, hundreds of police conducted a methodical,house-to-house sweep in Watertown for Tsarnaev. Tamerlan Tsarnaev, 26died after a dramatic car chase and shootout with police during whichthe more than 200 rounds of ammunition were fired. As they were pursued,the brothers threw several pipe bombs and a grenade at police as theyattempted to flee in a carjacked SUV.

Tamerlan, badly wounded, wasleft at the scene by his younger brother, who apparently backed overhim as he sped away in a carjacked Mercedes SUV.

State PoliceSuperintendent Timothy Alben said Dzhokhar Tsarnaev later abandoned thestolen vehicle in Watertown and fled by foot.

Authorities no longer believe there are other accomplices.

"This is a dangerous person, people need to be extremely careful if they even suspect this individual,'' Alben said.

Duringthe overnight and early-morning pursuit of the brothers, a federalofficial familiar with the case said authorities recovered a handfulof improvised explosive devices (IEDs), including one in the possessionof Tamerlan Tsarnaev. All of the devices appeared to be homemadeexplosives, including pipe bombs. Several were detonated by policeFriday afternoon.

Police took Tamerlan Tsarnaev to Beth IsraelDeaconess Medical Center following the exchange of gunfire with policeat about 1:20 a.m. Friday. Dr. David Schoenfeld said medical personneltried to revive him. He had multiple gunshot wounds and burn and gapingblast wounds that appeared to have come from an explosive devicestrapped to his body.

The brothers' acts continue to befuddleauthorities, family and friends that know them. Students at theUniversity of Massachusetts Dartmouth, where Dzhokar was a student, saythey saw him on campus following Monday's bombings.

lnvestigators have not found any formal links so far to an international terror group.

Dzhokar'sescape prompted Gov. Patrick to order the city of Boston and itssurrounding suburbs locked down and its residents to remain in theirhomes for much of Friday. The Boston Red Sox and Bruins postponed Fridaynight games. Businesses in Watertown, Newton, Waltham, Belmont,Cambridge and the Alston and Brighton neighborhoods of Boston wererequested to remain closed and residents to remain indoors until thesuspect is caught. Massachusetts shut down all mass transit, includingbuses and trains, in Boston and surrounding suburbs, Kurt Schwartz,director of Massachusetts Emergency Management Agency said.

TheTsarnaev family is believed to have moved to the USA in 2003. They hadlived in Kazakhstan for several years after fleeing war-torn Chechnya.Tamerlan attended Bunker Hill Community College in nearby Charlestown asa part-time student for three semesters from 2006 to 2008. He studiedaccounting.

In an telephone interview from Russian with theAssociated Press, the brothers' father, Anzor Tsarnaev, said Dzhokhar is"a true angel" and "an intelligent boy." In subsequent mediainterviews, he said his sons had been framed for Monday's bombings.

Ruslan Tsarni, an uncle who had not spoken to his brother's sonssince 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 weaponstraining they may have received. Tsarni called the brothers "losers" andsaid they had brought his family shame.

Their names were notknown to law enforcement officials before the bombings, which killedthree people and wounded 176. Authorities are reviewing the brothers'possible ties to Chechnya - an area of Russia plagued by Islamicinsurgency - a law enforcement official who is not authorized tocomment publicly told USA TODAY.

Dzhokhar Tsarnaev is believed tohave dropped a backpack laden with explosives at the site of Monday'ssecond explosion. He was pictured wearing a white baseball cap in videoimages released by the FBI Thursday. His page on the Russian socialnetworking site Vkontakte says he attended Cambridge Rindge and LatinSchool, graduating in 2011, the year he won a $2,500 college scholarshipfrom the city of Cambridge. On the website, his world view is describedas "Islam" and he says his personal goal is "career and money."

Larry Aaronson, a neighbor and retired history teacher at CambridgeRindge and Latin School, got to know Dzhokhar while taking photos of thehigh school wrestling team and other school activities.

"It'scompletely out of his character," Aaronson said of Dzhokhar's allegedrole in the bombings. "Everything about him was wonderful. He wascompletely outgoing, very engaged, he loved the school. He was gratefulnot to be in Chechnya."

Dzhokhar was not overtly political or religious, Aaronson says. "He spoke and acted like any other high school kid."

Aaronsonsays he can't reconcile the young man he knows with thecharacterizations he's seeing in the media. "I cannot do it," he says."I mean this from the deepest part of my heart: It's not possible it'sthe same person. It's just not possible."

The manhunt for themarathon bombing suspects turned into hot pursuit late Thursday evening.MIT campus police officer Sean Collier was shot multiple times as hewas sitting in his car.

Collier, 26, was later pronounced dead atMassachusetts General Hospital. He had been a campus cop since January2012 and previously, a civilian employee at the Somerville PoliceDepartment.

The suspects carjacked a Mercedes SUV between 12:15and 12:30 a.m, holding the driver at gunpoint for a half hour before hewas shoved from the car unharmed. A federal law enforcement official,who was not authorized to comment publicly, said the men allegedly toldthe driver that they were the Marathon bombers.

The official saidthe suspects' allegedly acknowledged their roles in the Marathonbombings to both intimidate the driver and brag about the bombings.

Policefound the car and the suspects in Watertown, and pursued them into aresidential neighborhood where gunfire was exchanged.

A transitpolice officer, Richard H. Donohue Jr., 33, was shot once during thefirefight. He underwent surgery and is listed in critical condition atMount Auburn Hospital.

Witnesses report hearing many gunshots.

Massachusetts StatePolice Superintendent Timothy Alben said Tamerlan Tsarnaev was shot bypolice in a gunfight following a pursuit that began late Thursday nightin Cambridge and ended a short time later in Watertown.

Albensaid the suspects also threw explosives from the car. The elderTsarnaev, with an explosive still in his possession, was hit bygunfire, prompting his younger brother to flee in the vehicle. Duringhis getaway he drove over his brother.

Residents, witnesses and media in the area heard at least two large booms.

"Iheard sirens, then a ton of gunshots,'' said Adam Healy, 31, abehavioral specialist for autism who lives less than a mile from thescene. "And then I heard an explosion amid the gunshots. After theexplosion, the sky lit up."

Dan MacDonald, 40, sitting in a second-story Watertown apartment, said he first heard sirens, then gunshots.

"Itwas about 10 to 15 shots. then there was an onslaught," he said. "Therewere 25 to 60 shots within 45 seconds. Then the shots stopped and boom.It was like dynamite."

Alvi Tsarnaev, another uncle of thesuspects, said Friday that Tamerlan phoned him Thursday night at about 7p.m., the first time they had spoken in about two years.

"Hesaid, 'I love you and forgive me,' " said Alvi Tsarnaev, who lives inMontgomery Village, Md. He wasn't seeking forgiveness for the bombing,but asking for forgiveness because he hadn't spoken to him in so long.

"We were not talking for a long time because there were some problems,"Alvi Tsarnaev said without elaborating. "We were not happy with eachother."

They spoke for about five minutes, he said. Tamerlan, whois Muslim, started out by saying, "Salam Aleikum," an Arabic greetingmeaning "peace on you." He then praised his uncle for keeping up withhis Muslim prayers.

"He told me he was happy," he said. "He wasasking, 'Did you pay your mortgage?' I told him I was trying to pay. Iasked him what he was doing. He said, 'I fix cars, I got married, got ababy.'

"Killing innocent people, I cannot forgive that," AlviTsarnaev said. "It's crazy. I don't believe it now even. How can Iforgive this?"

The Lowell Sun reported that Tamerlan Tsarnaev was a GoldenGloves boxer who told the newspaper that "I like the USA" after winninghis first fight in 2004 in Lowell. He fought in the 178-pound noviceclass.

According to the Sun, Tamerlan and his family moved to the USA in 2003, hoping to start a new life. "America hasa lot of jobs. That's something Russia doesn't have. You have a chanceto make money here if you are willing to work," he told The Sun.

Contributing:John Bacon and Mary Beth Marklein in McLean, Va.; Yamiche Alcindor andMelanie Eversley in Boston, William Welch in Los Angeles, Judy Keen inChicago and Shawn Cohen of The (Westchester County, N.Y.) JournalNews.

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