Three people were shot and killed at a shooting at a nightclub in Wicksburg, Alabama, on Thursday night. According to police, the suspect is 22-year-old Ryan Clark Peterson, who is currently still at large. One person was also injured in the incident. The police have his vehicle, and are using dogs and helicopters to chase Peterson down. The shooting comes in the wake of two mass killings in the past month, at a movie theater in Colorado and a Sikh temple in Wisconsin.