A lockdown was put in place at Waconia High School Friday morning after the sharing of an "inappropriate video" before classes started.
The video shared on social media was reported by a parent, prompting a police response to the Waconia Learning Center at 7:53 a.m.
The Carver County Sheriff's Office says deputies arrested a 16-year-old boy for "terroristic threats and disorderly conduct."
The lockdown was imposed and deputies remained in and around the school as a precaution, with investigators also checking into the report of a second threat received through social media.
Students are being released early on Friday at the request of the sheriff's office.
More information is expected to be released later on Friday, though Waconia HS principal Mark Fredericksen said nobody was threatened, there were no weapons on school property, and Waconia schools "were not even mentioned."
"The system worked," said Waconia Public Schools Superintendent Pat Devine in a statement.
"When people see something, we need them to say something and that's what happened here. Due to the swiftness of everyone’s actions, at no time during this situation were students in imminent danger. We are very thankful for our parents, staff and the local authorities, for working together to ensure the safety of all students."