The FBI is probing the attempted assassination of former President Trump, treating it as a potential act of domestic terrorism, involving over 100 witness interviews and searches of the suspect’s home and vehicle. Suspicious explosive devices were found in the suspect's car and home, which are being analyzed at the FBI laboratory. The suspect also purchased ammunition before the rally. The suspect used his father's legally purchased AR-15-style rifle in the shooting. He had asked to borrow it earlier that day to go to a shooting range. Investigators are still working to determine the suspect's motive. His cell phone has been cracked but no clear motive has emerged from interviews or evidence.