BOSTON — An FBI expert has told the jury in the trial of Boston Marathon bomber Dzhokhar Tsarnaev 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.

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