The Bureau of Alcohol, Tobacco, Firearms and Explosives confirmed Thursday that the weapons used in the shootings at a Southern California treatment facility were all purchased legally.
According to a story from CBS News, two of the guns were purchased by someone other than Syed Rizwan Farook and Tashfeen Malik, the pair identified by authorities as the shooters in Wednesday's attack on a holiday party at the Inland Regional Center in San Bernardino.
According to an NBC story, Farook and Malik were carrying two .223-caliber assault rifles and two semi-automatic 9 mm handguns, and fired between 60 and 70 rounds at the center. Police say they had 1,400 rounds of ammunition for the rifles and 200 rounds for the handguns inside the rented vehicle in which they were shot and killed by police.
A spokesperson for the ATF said all four guns recovered were purchased four years ago. Neither Farook nor Malik were the legal purchaser of the rifles. Investigators are working to track down that person who purchased the rifles, whom authorities say is known to investigators.