Nine people were arrested at the Kentucky State Fair, which closed Saturday night after suspicious activity was reported to law enforcement, authorities said.

Kentucky State Police said in a statement on Twitter that the fair began a "soft close" at about 10 p.m. Saturday to ensure the safety of attendees. Police said there were no reported injuries.

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The initial investigation shows that a group of people "caused panic with noise-making devices, leading fair goers to believe shots" had been fired, police said Sunday in a news release. Investigators have found no physical evidence that a weapon was fired, but the investigation is ongoing, police said.

Nine people were arrested at the Kentucky State Fair for suspicious activity. They were charged with disorderly conduct, possession of a handgun and possession of stolen property.

A group caused panic at the Kentucky State Fair with noise-making devices that led people to believe gunshots were fired. While they did possess a handgun, investigators did not find evidence that it was fired.

Three adults and six minors were charged with offenses that included disorderly conduct, menacing, possession of stolen property and possession of a handgun, police said.

The fair resumed normal operations on Sunday, officials said.

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The Kentucky State Fair, which began Thursday, is an annual multiday event held at the Kentucky Exposition Center in Louisville.