FBI agent to testify against friend of accused Boston bomber

BOSTON - An FBI agent who interrogated a friend of the accused Boston Marathon bomber charged with obstructing the investigation into the blasts was expected to testify on Monday as the second week of the trial begins.

Azamat Tazhayakov is the first of three friends of Dzhokhar Tsarnaev to face trial on charges of interfering with the investigation by going to the suspect's dorm room and removing a laptop and backpack containing empty fireworks casings three days after the April 15, 2013, attacks.