The Omaha Sheriff’s Office and Fire Department responded to the school at 10:22 a.m., where they found 50-year-old Kevin Garrison working underground near the school’s football field. Garrison was an employee of Elkhorn Public Schools.

In a statement sent to the students’ families, the Elkhorn School District said the man was working in a geothermal well. Students were dismissed for the day at 11:45 a.m.

“Following a medical emergency involving a maintenance worker at a geothermal well at ENHS, power has been shut off to the school and students are required to adhere to the standard response protocol of ‘on guard,’” the statement said.

“Therefore, all students will be dismissed immediately. Students who need to be picked up will be monitored by school staff in the building and can be picked up as soon as you are available.”

The crash did not pose a threat to anyone at the high school or nearby Grandview Middle School, the Sheriff’s Office said. The investigation is ongoing.