A sewage line backup Monday morning at Rosemount High School forced officials to call off classes for the rest of the day and send students home.

"An issue with a sewer line requires us to close the building," Principal Pete Robackwrote in an email to parents.

Students in the south metro high school were dismissed about 10:30 a.m. after the custodial team and district leadership determined "we could not provide a healthy learning environment for the remainder of the day," Roback said.

The district called in bus drivers to take students home.

Students were told that after-school activities were canceled unless they were otherwise notified by a coach or adviser, the email said.

No other details were immediately released. Classes are expected to resume Tuesday, Roback said.