Boston bombing investigators look abroad

The FBI expanded its investigation into a search for possible co-conspirators in Russia.

What happened

The FBI expanded its investigation into the Boston Marathon bombing this week into a search for possible co-conspirators, after Russian officials said that bomber Tamerlan Tsarnaev met with Islamic militants on a 2012 trip there. Authorities were focused on the elder Tsarnaev brother’s six-month visit to Dagestan, a violence-plagued Islamic province bordering Chechnya. While there, Russian officials told the FBI, he met with jihadist recruiter Mahmoud Mansour Nidal, who died in a gun battle with Russian forces last year. Russian officials also said that Tsarnaev, 26—who died in a shootout with police in Watertown, Mass.—exchanged emails with William Plotnikov, an ethnic Russian from Canada who joined the Islamist insurgency in Dagestan. Russian police killed Plotnikov in July, and Tsarnaev returned to the U.S. a few days later. “He intended to join the fighters,” said a Russian official, “but he lost his contacts.”

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