At least three people were killed and three others were injured by a gunman at the Grand Sierra Resort casino in Reno, Nevada, on Monday, authorities said.Reno Police Chief Kathryn Nance and Sparks Police Chief Chris Crawforth were among a number of officials who held an afternoon press conference to provide an update on the shooting,

The gunman shot five people at a valet area, fired at a resort security guard, who wasn’t injured, and then fatally shot someone driving by before police shot him, authorities said.

Four of the men shot outside of the Grand Sierra Resort were visiting Reno for a bachelor party. All of the men graduated from Thousand Oaks High School more than a decade ago. Amanda Starrantino reports.