A 14-year-old girl was found not criminally responsible for shooting and killing a classmate at a California youth exposition, police said Wednesday.

The girl was arrested Tuesday night after she allegedly shot another classmate who was standing nearby, said Officer David Hahn of the Los Angeles County Sheriff’s Department.

The victim, a 14-month-old boy, was rushed to a hospital and pronounced dead on Tuesday, but no arrests were made.

The girl was charged with murder in the boy’s death, Hahn said.

Hahn declined to say whether the girl was a student at the Cal Expo.

“We have no information that she’s been a student,” Hahn told reporters at the news conference.

“She is a 14 year old girl.

The only reason we’re talking about her is because she’s a 14.

She has a gun and it was discharged at the scene.”

The boy’s body was found inside a bathroom at the Expogrounds after the girl shot him, Hahns said.

“It is very disturbing that a 14 or 15-year old would shoot and kill someone,” Hahahn said, adding that he had no additional information on the shooting.

The incident happened at the California State Fairgrounds, a popular tourist destination in the San Fernando Valley.

Hahns called the shooting “horrific” and urged everyone to remain calm and watch for any possible clues about who the suspect is.

“The safest thing to do is to be aware of what you’re looking for and to be vigilant,” he said.