A man was arrested Monday morning at the BMW Championship at Conway Farms Golf Club for trying to bring in a concealed firearm, Lake Forest police said.
The man was stopped by security at the main entrance of the event, which was rained out Sunday and finished Monday instead.
After the arrest, a trained explosives detection canine from the Bureau of Alcohol, Tobacco and Firearms detected a suspicious substance in the man's car, which was located in a remote parking lot on Riverwoods Road south of Route 60, police said.
Explosives technicians from the Waukegan Fire Department used a remote control robot to search the trunk of the car. Two additional guns were found in the trunk, police said.
The man is not being identified, pending charges to be approved by the Lake County state's Attorney's office.
Riverwoods Road remained closed for about two hours Monday morning.