Questions linger year after Boston Marathon bombs

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Questions linger year after Boston Marathon bombs
FILE- In this Oct. 13, 2014 file photo, Ailiana Tsarnaeva, sister of Boston Marathon bombing suspect Dzhokhar Tsarnaev, departs district court in Boston's South Boston neighborhood. Tsarnaeva has been arrested in New York City for allegedly threatening to bomb a Harlem woman. Police say that she is charged with aggravated harassment for threatening the woman over the phone on Monday, Aug. 25. She was issued an appearance ticket and is due back in court on Sept. 30. (AP Photo/Steven Senne, File)
FILE - In this Friday, April 19, 2013 file photo provided by the Massachusetts State Police, 19-year-old Boston Marathon bombing suspect Dzhokhar Tsarnaev leans over in a boat at the time of his capture by law enforcement authorities in Watertown, Mass. Tsarnaev has pleaded not guilty in the April 15, 2013, Boston Marathon bombing, which killed three people and injured more than 260 others. His brother, Tamerlan Tsarnaev, died following a shootout with police. The Boston Marathon bombing has been selected the sports story of the year in an annual vote conducted by The Associated Press. (AP Photo/Massachusetts State Police, Sean Murphy, File)
Graphic shows photos of suspects; locates Watertown and Cambridge, Mass., where Boston Marathon bombing suspects exchanged gunfire and one is dead
This Friday, April 19, 2013 image made available by the Massachusetts State Police shows 19-year-old Boston Marathon bombing suspect, Dzhokhar Tsarnaev, hiding inside a boat during a search for him in Watertown, Mass. He was pulled, wounded and bloody, from the boat parked in the backyard of a home in the Greater Boston area. Two U.S. officials say the surviving suspect in the Boston bombings was unarmed when police captured him hiding inside a boat in a neighborhood back yard. Authorities originally said they had exchanged gunfire with Dzhokhar Tsarnaev for more than one hour Friday evening before they were able to subdue him. (AP Photo/Massachusetts State Police)
This still frame from video shows Boston Marathon bombing suspect Dzhokhar Tsarnaev visible through an ambulance after he was captured in Watertown, Mass., Friday, April 19, 2013. A 19-year-old college student wanted in the Boston Marathon bombings was taken into custody Friday evening after a manhunt that left the city virtually paralyzed and his older brother and accomplice dead. (AP Photo/Robert Ray)
FILE - This undated file photo provided by the Middlesex District Attorney's Office shows Massachusetts Institute of Technology Police Officer Sean Collier, 26, of Somerville, Mass., who was shot to death Thursday, April 18, 2013 on the school campus in Cambridge, Mass. Stephen Silva, a friend of Boston Marathon bombing suspect Dzhokhar Tsarnaev, was arrested Tuesday, July 22, 2014, and is believed to have provided the handgun used to kill Collier. (AP Photo/Middlesex District Attorney's Office, File)
In this April 19, 2013, Massachusetts State Police photo, state troopers prepare for the final assault on the boat where Boston Marathon bombing suspect Dzhokhar Tsarnaev was hiding in Watertown, Mass. Tsarnaev, 19, was captured later that night. (AP Photo/Massachusetts State Police, Sean Murphy)
In this Friday, April 19, 2013 Massachusetts State Police photo, law enforcement officials converge on the scene near where Boston Marathon bombing suspect Dzhokhar Tsarnaev was thought to be hiding in Watertown, Mass. Tsarnaev, was captured later that night, bleeding and hiding in a boat in a nearby backyard. Photos of the Boston Marathon bombing suspect's surrender have been posted on the Boston Magazine website. The additional images, made public made public Tuesday, Aug. 27, 2013, were among those released to the magazine last month by a state police photographer. (AP Photo/Massachusetts State Police, Sean Murphy)
Heavily armed police continue to patrol the neighborhoods of Watertown, Mass. Friday, April 19, 2013, as they continue a massive search for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours after an encounter with law enforcement. (AP Photo/Craig Ruttle)
A police officer runs with his weapon drawn as he conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist.(AP Photo/Matt Rourke)
Officials wearing tactical gear stand near an armored vehicle as they search an apartment building for one of two suspects in the Boston Marathon bombing, in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Julio Cortez)
BOSTON - APRIL 15: Police walk through the evacuated scene at Exeter and Boylston Streets after two explosions went off near the finish line of the 117th Boston Marathon on April 15, 2013. This image was taken at 3:05:12 p.m. (Aaron Tang for The Boston Globe via Getty Images)
BOSTON, MA - APRIL 7: People attend the Boston Marathon memorial exhibition, 'Dear Boston: Messages from the Marathon Memorial,' at the Boston Public Library April 7, 2014 in Boston, Massachusetts. Three spectators were killed and more than two hundred sixty injured when two bombs exploded on Marathon Monday, which prompted a massive manhunt for suspects later identified as Tamerlan and Dzhokhar Tsarnaev, two brothers from Chechnya, living in Cambridge, Massachusetts. Photo by Darren McCollester/Getty Images)
LOWELL, MA - NOVEMBER 9: Kevin Corcoran leans over to kiss his wife, Celeste, during a Tsongas Arena hockey game and an event called Riverhawks Strong to honor victims and first responders of the Boston Marathon bombing. Celeste, who lost both her legs in the attack, was tired after being on her legs more than 12 hours. (Photo by John Tlumacki/The Boston Globe via Getty Images)
BOSTON - FEBRUARY 12: Boston Marathon bombing survivor Marc Fucarile attended a hearing for suspect Dzhokhar Tsarnaev in US District Court, on Wednesday Feb. 12, 2014, where the judge set trial for Nov. 3. Fucarile declined to speak to media outside the courthouse. (Photo by Pat Greenhouse/The Boston Globe via Getty Images)
WATERTOWN, MA - APRIL 7: The home on Franklin Street where Dzhokhar Tsarnaev was found hiding in a boat in the backyard is seen April 7, 2014 in Watertown, Massachusetts. Dzhokhar Tsarnaev, along with his deceased brother Tamerlan, are accused of setting off two bombs at the 2013 Boston Marathon finish line that killed three spectators and injured over two hundred and sixty. Following a shootout with police just a few blocks from this home, Tamerlan was run over by his brother while fleeing, prompting a day long manhunt through the streets of Watertown. Photo by Darren McCollester/Getty Images)
CAMBRIDGE, MA - APRIL 7: A stone memorial honors Massachusetts Institute of Technology police officer Sean Collier April 7, 2014 in Cambridge, Massachusetts. Collier was killed on the night of April 18, 2013, as he sat in his patrol car in the plaza at the intersection of Vassar and Main Streets, when two suspects in the Boston Marathon bombings attempted to steal his weapon. The two men were later identified as Tamerlan and Dzhokhar Tsarnaev. (Photo by Darren McCollester/Getty Images)
LOWELL, MA - NOVEMBER 9: Celeste Corcoran waves to a standing ovation at Tsongas Arena during an event called Riverhawks Strong to honor victims and first responders of the Boston Marathon bombing. Celeste, who lost both her legs in the attack, holds onto her husband, Kevin, as daughter Sydney, rear, looks on. (Photo by John Tlumacki/The Boston Globe via Getty Images)
BOSTON - APRIL 15: Emergency personnel respond to the scene at Exeter and Boylston Streets after two explosions went off near the finish line of the 117th Boston Marathon on April 15, 2013. This image was taken at 2:57:25 p.m. (Aaron Tang for The Boston Globe via Getty Images)
BOSTON - APRIL 15: Emergency personnel respond to the scene at Exeter and Boylston Streets after two explosions went off near the finish line of the 117th Boston Marathon on April 15, 2013. This image was taken at 2:52:36 p.m. (Aaron Tang for The Boston Globe via Getty Images)
BOSTON - APRIL 15: Emergency personnel respond to the scene at Exeter and Boylston Streets after two explosions went off near the finish line of the 117th Boston Marathon on April 15, 2013. This image was taken at 2:58:34 p.m. (Aaron Tang for The Boston Globe via Getty Images)
BOSTON - APRIL 15: Emergency personnel respond to the scene at Exeter and Boylston Streets after two explosions went off near the finish line of the 117th Boston Marathon on April 15, 2013. This image was taken at 2:52:19 p.m. (Aaron Tang for The Boston Globe via Getty Images)
BOSTON - APRIL 15: Emergency personnel respond to the scene at Exeter and Boylston Streets after two explosions went off near the finish line of the 117th Boston Marathon on April 15, 2013. This image was taken at 2:52:07 p.m. (Aaron Tang for The Boston Globe via Getty Images)
In this magazine cover image released by Wenner Media, Boston Marathon bombing suspect Dzhokhar Tsarnaev appears on the cover of the Aug. 1, 2013 issue of "Rolling Stone." (AP Photo/Wenner Media)
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BOSTON (AP) -- A surveillance video shows a man prosecutors say is Dzhokhar Tsarnaev placing a bomb near the finish line of the Boston Marathon, just yards from where an 8-year-old boy was killed when it exploded.

A hand-scrawled confession condemning U.S. actions in Muslim countries was found on the inside wall of the boat where Tsarnaev was captured four frantic days later.

A year after twin pressure cooker bombs shattered the marathon and paralyzed the area for days, federal prosecutors say they have a trove of evidence ready to use against the surviving suspect, but many questions remain.

What roles did Dzhokhar Tsarnaev and his older brother, Tamerlan, play in planning and orchestrating the attack? Would they really have launched a second attack in New York? Did federal authorities underreact to a warning from Russia that Tamerlan Tsarnaev was becoming radicalized?

With Tamerlan Tsarnaev killed in a police shootout days after the attack, some of those questions may never be fully answered.

"The obvious one is the motivation and how could two young men who were in a country that, from all appearances, was very good to them end up this radical," said former Boston Police Commissioner Ed Davis, who helped lead the investigation.

The bombings last April 15 killed three people and injured more than 260 near the finish line of one of the world's most famous marathons. At least 16 people lost limbs.

Dzhokhar has pleaded not guilty to a 30-count federal indictment that carries the possibility of the death penalty.

The brothers, ethnic Chechens who lived in the former Soviet republic of Kyrgyzstan and the Dagestan region of Russia, settled in Cambridge, outside Boston, after moving to the U.S. as children with their family more than a decade ago.

Dzhokhar's defense team, which includes two of the nation's top anti-death penalty lawyers, appear to be building a case that Tamerlan, 26, was the driving force behind the bombings. In court documents, they've focused on Dzhokhar's young age - 19 at the time of the bombings - and the influence his older brother had on him.

A congressional report released last month said U.S. intelligence agencies missed a chance to detain Tamerlan when he returned from a trip to Dagestan in July 2012.

Russian authorities had warned the FBI in 2011 about Tsarnaev becoming radicalized. The FBI investigated, and his name was added to a terrorism watch list. But he was still able to fly to Dagestan - an area that has become the center of an Islamic insurgency - spend six months there, and return to the United States.

"There was not sufficient weight put on the information we got from Russia," said U.S. Rep. William Keating, D-Mass., a member of the House Committee on Homeland Security.

A separate report found that Russia was unresponsive when pressed by the FBI for more details.

Three days after the bombings, the FBI released photos of the Tsarnaevs from surveillance video near the bombing sites. Hours later, authorities say, the brothers shot and killed a Massachusetts Institute of Technology police officer in an attempt to steal his gun, then carjacked a Cambridge man.

"`Where's your money?'" carjacking victim Danny Meng said Tamerlan Tsarnaev demanded of him after jumping into his car and showing him a gun.

What Meng thought would be a quick robbery became more terrifying when the man asked him whether he knew about the marathon bombings.

"He said, `Do you know who did that? I did that.'"

Meng said Tamerlan asked him, "Can your car drive out of state, like to New York?"

A week later, former New York Police Commissioner Raymond Kelly said Dzhokhar Tsarnaev told investigators from his hospital bed that he and his brother decided that night to drive to New York City and launch a second attack.

Meng escaped by running when the Tsarnaevs stopped at a gas station. Authorities said the brothers drove to nearby Watertown, where a wild gun battle with police erupted on a quiet side street, with the brothers shooting at officers and throwing three pipe bombs and one pressure cooker bomb.

Tamerlan Tsarnaev was killed, but Dzhokhar escaped on foot, leading to an unprecedented lockdown of Greater Boston. Dzhokhar, wounded from gunfire, was found later that day hiding in a dry-docked boat in a backyard.

Authorities said Dzhokhar wrote in pen on the inside wall of the boat explaining that the bombing was meant to punish America for its actions overseas.

"The U.S. Government is killing our innocent civilians," authorities say he wrote, and "Stop killing our innocent people and we will stop."

A federal grand jury continued to investigate months after Dzhokhar was arrested.

The parents and sisters of Tamerlan Tsarnaev's widow, Katherine Russell, were called to testify. Russell has a 3-year-old daughter with Tsarnaev.

Russell's lawyer, Amato DeLuca, said that she did not suspect her husband of anything and that nothing seemed amiss in the days after the bombing. He said Russell was told last year she was not a target of the investigation.

"It really saddens me to think the people, obviously innocent victims, are going to carry the wounds from this craziness the rest of their life," DeLuca said. "That includes Katie and her daughter."

People who knew Dzhokhar say they still struggle to reconcile the seemingly Americanized young man they knew with the one accused of planting the bomb that killed Martin Richard, 8, and Lu Lingzi, 23, a Boston University graduate student from China. The first bomb, allegedly planted by Tamerlan, killed Krystle Campbell, 29.

Luis Vasquez, who helped coach Dzhokhar's soccer team in high school, said both brothers appeared to be good people when he knew them. The death penalty, he said, would be the easy way out.

"That event should eat at him," Vasquez said. "If we kill him, he will take those answers with him."
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