NRHEG High School in New Richland underwent a soft lockdown Monday morning, according to Superintendent Kevin Wellen.

“There was a possible disruption we did not want to expose the kids to,” said Wellen. “It was between one adult and another.”

Wellen and local police met with an individual at the front doors of the school and the matter was resolved.

The incident occurred around 10:30 a.m. and lasted 21 minutes.

In a soft lockdown, lights are left on and teaching continues. In the case of a hard lockdown, lights are turned off, curtains are pulled and students wait in a designated area.

Lockdown drills are held at least once a year.