Mount Logan Middle School has been evacuated twice this week after officials say new sensors installed at the school resulted in false fire alarms.

According to Shana Longhurst, spokesperson for the Logan City School District, the latest evacuation occurred yesterday morning, though she was unable to provide a specific time, after a newly installed sensor alerted fire in the building.

“The fire department arrived very quickly,” Longhurst said, but ultimately no fire was found.

“Residual oil” on the sensor triggered the alarm, Longhurst said, explaining the sensors were sensitive to heat and smoke. Another evacuation at Mount Logan occurred earlier in the week after a similar sensor detected a fire that didn’t exist.

Longhurst said the sensors were located in the walls, but were accessible by personnel. Issues with new equipment, Longhurst said, are not uncommon.

“Sometimes, there’s some little quirks,” Longhurst said.

Students were removed from their classes for under 30 minutes during the incident, Longhurst said, and maintenance crews have been working to avoid similar issues in the future.