The school was put into a full lockdown at around 12:40 p.m.
Parents were asked earlier in the day to not come to Essex High School.
A mid-Michigan high school went on lockdown for about half an hour this afternoon after a report of a student with a weapon making a threat.
Students were eventually released from the schools but police stayed and conducted another extensive sweep overnight, finding nothing.
Today, police once again have a presence at the school to reassure students of their safety.
The other schools involved are Hiawatha Elementary, Summit Street School, Thomas Fleming School, Albert D. Lawton School (ADL), and the Center for Technology.
According to Murtie they, "received a call about 45 minutes ago from a male subject who indicated that he was in a position to do some harm to students in the school and made some demands". School will dismiss at the usual time at all buildings. Police and emergency crews rushed to the school.
An email from Chittenden Central Supervisory Union Superintendent Judith DeNova to families states that police were notified of an armed individual threatening to appear at Essex High School.
All of the other district's buildings were also placed on lock down during the incident "as an additional precaution", officials said.