(KMIZ)The shooting in Highland Park, Ill. is the latest of several mass shootings, that have many people on edge when attending large gatherings. The Boone County Sheriff's Office said the increased violence is on their minds. Brian Leer with the Boone County Sheriff's Office said. Columbia police said in light of recent events, measures are being taken to ensure public safety. Before an event, often the agencies working it will come together and develop safety procedures.