Jury in Boston Marathon trial sees tattered backpack that held bomb used in deadly 2013 attack

FILE - In this April 16, 2013 file photo, investigators examine the scene of the second bombing outside the Forum Restaurant on Boylston Street near the finish line of the 2013 Boston Marathon, a day after two blasts killed three and injured more than 260 people. During testimony Wednesday, March 11, 2015, in the federal death penalty trial of Dzhokhar Tsarnaev in Boston, an FBI agent held up pieces of the black and white backpack he said were found near the Forum restaurant, where Tsarnaev has admitted detonating one of the bombs. (AP Photo/Elise Amendola, File) (The Associated Press)

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FILE - This undated file photo released by the Middlesex District Attorney's Office shows Massachusetts Institute of Technology Police Officer Sean Collier, of Somerville, Mass. Investigators said Collier was shot to death Thursday, April 18, 2013 on the school's campus in Cambridge, Mass., by Boston Marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev in a botched attempt to obtain his gun several days after the twin explosions. During testimony Wednesday, March 11, 2015, in the federal death penalty trial in Boston of Dzhokhar Tsarnaev, MIT Police Chief John DiFava testified he told Collier to "be safe" about an hour before he was shot dead. Prosecutors said the Tsarnaev brothers killed Collier during an unsuccessful attempt to steal his gun. Dzhokhar Tsarnaev's lawyer said during opening statements that it was Tamerlan Tsarnaev who shot Collier.(AP Photo/Middlesex District Attorney's Office, File) (The Associated Press)

FILE - In this November 2012 file photo provided by Nicole Lynch, her brother, Sean Collier, stands in his driveway in Somerville, Mass., frying a turkey for his annual kickball Thanksgiving gathering. Collier, a Massachusetts Institute of Technology police officer, was shot to death on the school campus in Cambridge, Mass., on April 18, 2013, three days after the Boston Marathon bombings. During testimony Wednesday, March 11, 2015, in the federal death penalty trial in Boston of Dzhokhar Tsarnaev, MIT Police Chief John DiFava testified he told Collier to "be safe" about an hour before he was shot dead. Prosecutors said the Tsarnaev brothers killed Collier during an unsuccessful attempt to steal his gun. Dzhokhar Tsarnaev's lawyer said during opening statements that it was Tamerlan Tsarnaev who shot Collier. (AP Photo/Nicole Lynch, File) (The Associated Press)

BOSTON – Jurors in the Boston Marathon trial on Wednesday saw the tattered pieces of the backpack that Dzhokhar Tsarnaev used to carry a bomb in the deadly 2013 attack.

FBI Special Agent Sarah De Lair held up pieces of the black and white backpack for the jury. De Lair said the pieces were found near the Forum restaurant, where Tsarnaev planted and detonated a bomb April 15, 2013.

Three people were killed and more than 260 injured when Tsarnaev and his older brother, Tamerlan, set off two pressure cooker bombs near the marathon finish line.

Photos show debris and abandoned items scattered on the sidewalk and street — clothing, a stroller, plastic water bottles and matching cowboy boots a few feet apart.

Dzhokhar Tsarnaev's lawyers have admitted he participated in the bombing but say Tamerlan was the mastermind. Tamerlan, 26, died in a shootout with police four days after the bombing.

Dzhokhar Tsarnaev, now 21, faces the possibility of the death penalty if convicted.

Later Wednesday, prosecutors are expected to begin presenting testimony on the fatal shooting of Massachusetts of Institute police Officer Sean Collier.

Collier was shot hours after the FBI released photos of the Tsarnaevs as suspects in the bombing and asked for the public's help in finding them.

Prosecutors say the Tsarnaev brothers killed Collier during an unsuccessful attempt to steal his gun. Dzhokhar Tsarnaev's lawyer said during opening statements that it was Tamerlan Tsarnaev who shot Collier.