Los Angeles County Sheriff Robert Luna said investigators found a "few items of interest" at the shooter's mobile home — some of which led officials to believe he was "manufacturing homemade firearm suppressors." The items were gathered from a search warrant that was executed earlier Monday.
Some of the other items recovered were a 308-caliber rifle and various electronic devices — such as cell phones and computers, Luna said at a news conference Monday.
Officials also found "hundreds of rounds" of ammunition, the sheriff said.
Ballistic and forensic comparisons will need to be done on all of the items that were recovered from the alleged shooter's home, Luna said.
He said there is "a lot of work to be done there, but we don't want to leave any stone unturned."
Luna said homicide investigators are still working on what he called a “very complex investigation.” The sheriff said there is still a lot of things they don’t know.
Luna said his office is working in partnership with the FBI, ATF and the district attorney's office, among others.