Flowers and messages at Paris' Place de la Republique commemorate the victims of last year's January and November shooting attacks. Charles Platiau/Reuters /Landov hide caption

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Tamerlan Tsarnaev, 26, center right in black hat, and his brother, Dzhokhar A. Tsarnaev, 19, were responsible for the 2013 bombings at the Boston Marathon, which killed three people and injured more than 260. Bob Leonard/AP hide caption

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Parallels

In Worst Attacks, Terrorists Often Have Fraternal Bonds

The Boston Marathon bombing, the Charlie Hebdo attacks and the recent rampage in Paris share a common element: all involved terrorists who were brothers.

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Pamela Geller is interviewed at The Associated Press on Thursday. Geller was the organizer of a controversial cartoon contest about the Prophet Muhammad in Texas last weekend where two men started shooting before they were killed by police. Mark Lennihan/AP hide caption

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Jean-Baptiste Thoret, Charlie Hebdo's film critic, speaks at a news conference in Washington on May 1. Thoret will receive, on behalf of Charlie Hebdo, the PEN American Center's Freedom of Expression Courage Award in New York on Tuesday. Andrew Caballero-Reynolds/AFP/Getty Images hide caption

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Stephane "Charb" Charbonnier, the late editor of Charlie Hebdo, is seen in September 2012. PEN American Center's decision to give the French satirical magazine its annual Freedom of Expression Courage Award has prompted six writers to withdraw from the annual event. Michel Euler/AP hide caption

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Stephane "Charb" Charbonnier, editor of Charlie Hebdo, is seen on Sept.19, 2012. The late editor takes on politicians, the media and "Islamophobia" in a posthumously published book completed two days before he was killed Jan. 7. Michel Euler/AP hide caption

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A drone is displayed Wednesday at Paris store Azur Modelisme. Law enforcement officials in the city are concerned about recent unexplained drone fly-bys of high-security sites, including the Eiffel Tower and the U.S. embassy. Eleanor Beardsley/NPR hide caption

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French comedian Dieudonne M'Bala M'Bala arrives for his trial at the courthouse in Paris on Jan. 28. He goes on trial again today on charges of "defending terrorism," following remarks he made on Facebook after the deadly attack on the satirical weekly Charlie Hebdo. Caroline Blumberg /EPA/Landov hide caption

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