All Ellsworth schools were closed Thursday due to a possible threat at the high school.

Prior to the start of classes Thursday, the school department said on its website that all schools in the district were closed after the "receipt of a message indicating a possible threat at Ellsworth High School."

School officials Thursday morning released no further information about the threat.

The threat is under investigation, and the school district said it's working closely with the Ellsworth Police Department.

"The safety of our students and staff is our highest priority."