 The FBI says it's investigating the attack as a potential act of domestic terror as they learn more about the 20-year-old shooter. CBS's Nicole Skanga. Right now, FBI and other federal law enforcement pouring over the internet trying to find any online footprint of this suspect, this individual, with no apparent criminal history, no derogatory information, no foreign nexus to terrorism. The shooter killed one person and injured two others who've just been upgraded to stable condition.