Tulsa's Wright Elementary School has been investigated for a possible natural gas leak. Firefighters were sent to the Tulsa Public Schools campus at 1110 East 45th Place to check out the odor.
It happened just before 8 a.m., according to a TPS spokesperson.
Firefighters say the smell came from a routine release from one of the Holly refineries. The readings inside the school were the same as the readings outside.
Classes were not affected, according to TPS.