Telluride High School was closed Monday following a number of posts on social media that referenced plans for a shooting similar to what took place at Columbine High School.
The Telluride Marshal's Department said a student notified a staff member about one of the threats around 3 p.m. Sunday and the school immediately contacted law enforcement.
The threat was posted on the Snapchat app and referenced a "Columbine-style" shooting that would take place at the school on Monday, deputies said.
One student was taken into custody in connection to the threat and law enforcement confiscated a rifle and a handgun from the student's home.
Later that day, deputies learned of another threat posted on Snapchat that referred to explosives planted around that school that were set to detonate on Monday.
School Superintendent Mike Gass consulted with law enforcement and decided to close the school for the day while the campus is searched for explosives and evidence of anything unusual, deputies said.
In addition to one student being taken into custody, at least five others are being question regarding the threats.
"We take these threats seriously and our investigation will be efficient and thorough," Chief Marshal James Kolar said.
The Telluride Marshal's Department is investigating with the assistance of the San Miguel Sheriff's Office, Mountain Village Police Department, Telluride Fire Protection District, the Grand Junction Office of the FBI and the Telluride School District.
Officials expect to reopen the school on Tuesday.
Anyone with information that may assist the investigation is asked to call the Telluride Marshal's Office at 970-728-3818.