Trials

FBI agent: Boston bomber's computer contained extremist materials

March 9, 2015: In this courtroom sketch, Dzhokhar Tsarnaev, right, and defense attorney Judy Clarke are depicted watching evidence displayed on a monitor during his federal death penalty trial.

March 9, 2015: In this courtroom sketch, Dzhokhar Tsarnaev, right, and defense attorney Judy Clarke are depicted watching evidence displayed on a monitor during his federal death penalty trial.  (AP Photo/Jane Flavell Collins)

Jurors in the trial of Boston Marathon bomber Dzhokhar Tsarnaev have been given a glimpse of his computer contents, which included extremist materials such as Inspire magazine.

An FBI computer forensics expert began testifying Thursday about materials collected from Tsarnaev's computer.

One file is called "Complete Inspire." In the indictment, prosecutors allege he downloaded a copy of Inspire that included instructions on how to build bombs with pressure cookers, the kind of device used in the marathon bombing.

During opening statements, a prosecutor cited Inspire as one way Tsarnaev and his older brother, Tamerlan, became radicalized.

Dzhokhar Tsarnaev could face the death penalty if convicted. Tamerlan died after a gunfight with police.

Three people were killed and more than 260 were injured in the 2013 marathon bombings.