Nails, BBs, pressure cooker parts and other potential bomb components were found inside Boston Marathon bomber Dzhokhar Tsarnaev's family apartment, an FBI agent testified Wednesday.
The items were found during a search four days after the 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 two pressure-cooker bombs in backpacks near the marathon finish line on April 15, 2013.