(4 Dec 2015) The FBI says it is investigating the deadly mass shooting in California as an "act of terrorism." David Bowdich, assistant director of the FBI's Los Angeles office, made the declaration at a news conference Friday. He also says the shooters attempted to destroy evidence, including crushing two cell phones and discarding them in a trash can. He says authorities continue to investigate the case to understand the shooters' motivations and whether they were planning more attacks. Find out more about AP Archive: http://www.aparchive.com/HowWeWork Twitter: / ap_archive Facebook: / aparchives Instagram: / apnews You can license this story through AP Archive: http://www.aparchive.com/metadata/you...