Apple head Tim Cook says the company will not assist the FBI. He says to do so could damage encryption for millions of other users.

苹果总裁蒂姆·库克称公司不会协助联邦调查局，他说这样做会破坏数百万其他用户的隐私。

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George Venizelos, head of the FBI's New York office, said the arrest was the latest in an FBI probe that has resulted in more than 70 arrests.

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After the hearing, the head of the FBI's Boston office, Richard DesLauriers, issued a statement describing the FBI and Boston police department's work together on a joint-terrorism task force, where police detectives had access to a database with the details of the FBI's inquiry into Mr. Tsarnaev.

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The head of the Boston FBI office, Richard DesLauriers, said the agency's joint terrorism task force would take the lead on the investigation, and federal agents were already traveling to the area.

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