TELLURIDE, Colo. (AP) — The Latest on social media threats made against a Colorado high school (all times local):

3:30 p.m.

Colorado authorities believe one student was responsible for threatening a "Columbine-style" attack at a high school in the Rocky Mountains resort town of Telluride.

A statement from the San Miguel County Sheriff's Office says the boy was released to his parents on Monday night and has been suspended from school.

Police say that interviews with other students suggested the male student sent the explosive threat on Snapchat and then made the shooting threat in a conversation thread.

Authorities said Tuesday that they were able to capture the first threat and plan to seek a search warrant for the shooting threat. Police haven't made any arrests.

Classes resumed Tuesday. Investigators searched the school Monday and found no weapons or explosives.

Police likely will remain at the school this week.

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9:35 a.m.

Classes are back in session at Telluride High School under heightened security as authorities continue to investigate social media threats made against the school.

The school was closed Monday after a student alerted officials about plans for a "Columbine-style" attack being discussed on Snapchat a day earlier. Investigators later discovered another post threatening to detonate explosives at the school.

A male student suspected of posting the explosives threat was taken into protective custody on Sunday. A handgun and rifle were seized at his home.

Members of various law enforcement agencies searched the school but didn't find any weapons or explosives.

Telluride Chief Marshal James Kolar says he's confident there's no threat to public safety at the school.