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BOSTON (AP) - A friend of Boston Marathon bombing suspect Dzhokhar Tsarnaev says he did not understand his constitutional rights while he was being questioned following the attack.

Dias Kadyrbayev is accused of removing items from Tsarnaev's dorm room several days after the bombings. He took the witness stand Monday during a hearing on his request to suppress statements he made to authorities.

The native of Kazakhstan said his English was not proficient enough for him to understand the written forms he signed that explained his right to remain silent and to speak to a lawyer. He also said he was intimidated while authorities questioned him.

During cross-examination, prosecutors showed Kadyrbayev emails, text messages and a college application, all written by him in English.

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