BELMONT — Union Local Elementary School canceled classes Wednesday due to an unidentified odor in the building.

The school district posted on social media that a “strong sewage or gas smell” was present in the structure prior to the start of the school day. Officials initially said the school would operate on a two-hour delay to allow time to “determine the cause and if the building is safe for students.” About 30 minutes later, the decision was made to close the building for the day.

“We have not been able to fully determine the gas/sewage smell. For that reason we are going to cancel today at the Elementary,” the district posted. “We plan on having school tomorrow. If anything changes, we will let you know.”