BOSTON (AP) -- Prosecutors rested their case against Boston Marathon bomber Dzhokhar Tsarnaev on Monday after jurors in his federal death penalty trial saw gruesome autopsy photos and heard a medical examiner describe the devastating injuries suffered by the three people who died in the 2013 terror attack.

Tsarnaev's lawyer told the jury during opening statements that Tsarnaev participated in the twin bombings but that his older brother, Tamerlan, was the driving force behind the attack. Prosecutors believe the brothers were seeking retaliation against the U.S. for wars in Muslim countries.

Now that prosecutors have finished their case, Tsarnaev's lawyers are presenting theirs. The defense has made it clear since testimony began March 4 that its strategy during the two-phase trial is not to win an acquittal for Tsarnaev but to save him from the death penalty.

Three people were killed and more than 260 were injured when two pressure-cooker bombs exploded near the finish line April 15, 2013.

Prosecutors presented heart-wrenching testimony from survivors who lost legs in the bombings and from the father of 8-year-old Martin Richard, the youngest person killed in the explosions. A string of first responders described a chaotic mix of smoke, blood and screams just after the bombs went off.

Jurors openly cried as they viewed Martin's autopsy photos, which showed a gaping wound in his abdomen. Dr. Henry Nields, chief medical examiner for Massachusetts, said Martin received injuries to virtually every part of his body, including lacerations of his liver, left kidney and spleen. His stomach was also ruptured.

Nields also displayed the blood-stained, shredded clothing that Martin was wearing when the blasts went off. His parents listened from the second row of the courtroom, and Bill Richard kept his arm around his wife's shoulder.

Nields said Martin suffered broken bones and third-degree burns. The injuries caused him to bleed to death.

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