Investigators say Sanford rammed his truck into the chapel before opening fire with an AR-15-style rifle and a handgun. Two victims were killed by gunfire, while three others perished in the fire, police said. Sanford was killed in a shootout with law enforcement. The FBI has joined the investigation, examining possible religious motivations as reports emerge of Sanford’s struggles with post-deployment mental health issues. Community members gathered outside the church late Sunday, consoling one another as emergency crews continued their work at the scene.