KUSA — A juvenile female has been arrested and faces charges in connection to multiple bomb and shooting threats reported at Roosevelt High School in Weld County this week.

The freshman faces a charge of false report of explosive devices, a felony, and interference with an educational institution, a misdemeanor. Aaron Sanchez with the Johnstown Police Department told 9NEWS she admitted to Tuesday's and Wednesday's threats. She's not been named as she is not 18 years old.

According to the Johnstown Police Department, "several" threats were reported via Safe2Tell starting on Tuesday. In a joint release from the Johnstown Police Department and the Weld RE-5J School District, both agencies said they believe the threats that were investigated were hoaxes, hence the false reporting charge for the girl.

"These threats are taken very seriously," the release read. "They are not a joke and can have devastating consequences."

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Sanchez also told 9NEWS that there is no reason to believe there is an ongoing threat, but it's possible more arrests will be made.

"Together, we are continuing to follow several other active leads related to the sources of the threats this week and other arrests are possible," the joint release read.

On Tuesday, Roosevelt High School was closed after the school was evacuated due to a Safe2Tell report.

The following day, Roosevelt was evacuated because of threats at the school. Students were taken to Grace Community Church while the threats were investigated. Letford Elementary School, which is located just a few blocks away, was also on lockout.

Thursday, for the third day in a row, more Safe2Tell tips came in. Milliken Middle School was put on lockout first. An hour later, Roosevelt High School was put on lockout, followed by nearby Letford Elementary. Police did another search and found nothing suspicious.

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Safe2Tell is an anonymous reporting tool run by the Colorado Office of the Attorney General. In light of the rampant threats, the Safe2Tell app has been removed from district-issued iPads used by students at the request of the Johnstown Police Department.

"We encourage students to continue to report tips to Safe2Tell by utilizing Safari on the iPads, calling 1-877-542-7233, or utilizing the Safe2Tell application on their personal devices," a release from the school read.