This story is free to read.

Expert to jury: Marathon bombs ‘not too difficult’ to build

This undated forensics photograph made by the FBI, released by the U.S. Attorney's office and presented as evidence during the federal death penalty trial of Dzhokhar Tsarnaev Wednesday, March 25, 2015, in Boston, shows Massachusetts driver's licenses of his brother Tamerlan Tsarnaev. Dzhokhar Tsarnaev is charged with conspiring with Tamerlan Tsarnaev to place two bombs near the Boston Marathon finish line that killed three and injured more than 260 spectators in April 2013. Tamerlan died days after the bombing when he was wounded during a gun battle with police and run over by Dzhokhar as he escaped. (AP Photo/U.S. Attorney's Office) This undated forensics photograph made by the FBI, released by the U.S. Attorney's office and presented as evidence during the federal death penalty trial of Dzhokhar Tsarnaev Wednesday, March 25, 2015, in Boston, shows Massachusetts driver's licenses of his brother Tamerlan Tsarnaev. Dzhokhar Tsarnaev is charged with conspiring with Tamerlan Tsarnaev to place two bombs near the Boston Marathon finish line that killed three and injured more than 260 spectators in April 2013. Tamerlan died days after the bombing when he was wounded during a gun battle with police and run over by Dzhokhar as he escaped. (AP Photo/U.S. Attorney's Office)

By Associated Press March 26, 2015 1 min read

BOSTON (AP) – An FBI expert has told the jury in the trial of Boston Marathon bomber Dzhokhar Tsarnaev (joh-HAHR’ tsahr-NEYE’-ehv) that the bombs used in the 2013 attacks were “not too difficult” to build.

Bomb expert Edward Knapp on Thursday identified photos of items found at the scene of the twin bombings, including hobby fuse, a toggle switch, small Christmas tree bulbs and electronic speed controllers from remote-controlled cars.

Knapp says the bombs used readily available parts and instructions easily found on the Internet.

Tsarnaev’s lawyers have admitted that he and his late brother, Tamerlan, detonated the bombs near the finish line April 15, 2013. But they say Tamerlan Tsarnaev was the mastermind.

Three people were killed and more than 260 were injured.

Tsarnaev faces the possibility of the death penalty.