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RENEE MONTAGNE, HOST:
The first trial connected to the Boston Marathon bombing is underway. The defendant is not the surviving suspected bomber, Dzhokhar Tsarnaev. It's Tsarnaev's friend - a 20-year-old from Kazakhstan who is accused of obstruction of justice. NPR's Tovia Smith reports.
TOVIA SMITH, BYLINE: As prosecutors tell it, Azamat Tazhayakov and his roommates saw photos of the alleged bombers and immediately recognized them.