BOSTON — FBI agents told jurors in the Boston Marathon trial that nails, BBs, pressure cooker parts and other items similar to those used in two pressure-cooker bombs that exploded near the marathon’s finish line were found in Dzokhar Tsarnaev’s family apartment in Cambridge.

The parts and others purchased by Tsarnaev’s brother were found during a search four days after the April 15, 2013 terror attack, which killed three people and injured more than 260 others.

Tsarnaev’s lawyers have admitted that he and his older brother, Tamerlan, planted and detonated the bombs.

But they say Tamerlan Tsarnaev was the mastermind of the attack.