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Brotherly bonds (clockwise from left): Khalid and Ibrahim el-Bakraoui were suicide bombers in Brussels. Brahim and Salah Abdeslam were involved in last November's Paris attacks. Dzhokhar and Tamerlan Tsarnaev bombed the Boston Marathon in 2013. Cherif and Said Kouachi committed the January 2015 attack on the French satirical magazine Charlie Hebdo. Interpol, Haberturk newspaper via AP; AFP/Getty Images, Belgian Federal Police via AP; The Lowell Sun & Robin Young/AP; Prefecture de Police de Paris/AP hide caption

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Interpol, Haberturk newspaper via AP; AFP/Getty Images, Belgian Federal Police via AP; The Lowell Sun & Robin Young/AP; Prefecture de Police de Paris/AP

Yet Again, A Major Terrorist Attack Has A Brotherly Connection

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In this courtroom sketch, Dzhokhar Tsarnaev (center) is depicted between defense attorneys Miriam Conrad (left) and Judy Clarke during his federal death penalty trial on March 5. Jane Flavell Collins/AP hide caption

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Jane Flavell Collins/AP

Azamat Tazhayakov, left, Dias Kadyrbayev, center, and Robel Phillipos, right, college friends of convicted Boston Marathon bomber Dzhokhar Tsarnaev, sit during a hearing in federal court in Boston in May 2014. Jane Flavell Collins/AP hide caption

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Jane Flavell Collins/AP

Judy Clarke and David Bruck, Dzhokhar Tsarnaev's defense attorneys, leave the Moakley federal courthouse on April 8 after their client was found guilty. John Blanding/The Boston Globe via Getty Images hide caption

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John Blanding/The Boston Globe via Getty Images

Flowers were placed at the site of the Boston Marathon finish line on Boylston Street last week. The city will mark the second anniversary of the deadly bombing Wednesday. Scott Eisen/Getty Images hide caption

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Scott Eisen/Getty Images

On 'One Boston Day,' City Marks Marathon Bombings' Anniversary

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In this courtroom sketch, defense attorney Judy Clarke is depicted addressing the jury as defendant Dzhokhar Tsarnaev sits during closing arguments in his federal death penalty trial on Monday. Jane Flavell Collins/AP hide caption

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Jane Flavell Collins/AP

Dzhokhar Tsarnaev (center) is depicted in this courtroom sketch between defense attorneys Miriam Conrad (left) and Judy Clarke during his federal death penalty trial in Boston. Jane Flavell Collins/AP hide caption

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Jane Flavell Collins/AP

In this courtroom sketch, Boston Marathon bombing suspect Dzhokhar Tsarnaev is depicted sitting in federal court for a pretrial hearing in Boston on Dec. 18. Tsarnaev is charged with the April 2013 bombing that killed three people and injured more than 260. He could face the death penalty if convicted. Jane Flavell Collins/AP hide caption

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Jane Flavell Collins/AP

In this courtroom sketch, Boston Marathon bombing suspect Dzhokhar Tsarnaev (third from right) is depicted with his lawyers and U.S. District Judge George O'Toole Jr., as O'Toole addresses a pool of potential jurors. The trial begins Wednesday. Michael Dwyer/AP hide caption

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Michael Dwyer/AP

A memorial at the site of the first explosion in the Boston Marathon bombing. Defense attorneys say too many people in the potential jury pool have some kind of personal connection to the case. Andrew Burton /Getty Images hide caption

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Andrew Burton /Getty Images

Accused Bomber's Lawyers Say Boston Jury Pool Is Too Biased

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