The terrifying threat was made just 30 minutes from the site of the deadly mass shooting that took place in Florida earlier this week.
A threatening note was reportedly left by the girl underneath the assistant head teacher’s school at Nova Middle School.
The note read: “I will bring a gun to school to kill all of you ugly a kids and teachers b****.
“I will bring the gun February, 16, 2018. Be prepared b****!”
However, the 11-year-old broke down in tears when confronted by officers over what she did, it has been reported.
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She was arrested earlier this week on a felony charge of written threats to kill, NBC has reported.
Elsewhere, in a separate incident, a South Carolina high school student has been arrested after posting a photograph of himself posing with a rifle and warning “round two of Florida tomorrow” on the social media platform Snapchat.
The teen from Spartanburg, USA, posted the picture while wearing a partial mask and holding what appears to be an assault rifle, the County Sheriff’s office said.
Authorities were alerted to the threat after a classmate who recognised the suspect told a parent.
Police rushed to the suspect’s home where they found the mask and what turned out to be a pellet gun.
But the teenager claimed it was supposed to be a joke.
Lieutenant Kevin Bobo said: “After informing the suspect and his parents of the law violation, the suspect stated his Snapchat post was just intended as a joke, and that he didn’t have any serious intentions.”
The antics of both the girl and teen schoolboy have come less than a week after the mass shooting in Florida in which 17 students and staff were murdered at a high school.
Speaking in the wake of the tragedy, US President Donald Trump said: “I want to speak now directly to America’s children, especially those who feel lost alone confused or even scared. I want you to know that you are never alone, and you never will be.”
However, Mr Trump steered clear of any discussion about America’s gun laws.