 Live in the News Center, Mark Garrison, WBT News. Thank you, Mark. Multiple law enforcement agencies are investigating the assassination attempt. The FBI is the lead agency. They're looking into the shooter's background, if vital security measures were taken, and whether this could have been prevented. Former FBI Assistant Director Chris Swecker here in Charlotte says Saturday became a day that many in law enforcement had been fearing. We have a threat climate out here, a threat level right now that's off the charts.