GREELEY, Colo. (AP) - Residents in the northern Colorado city of Greeley are suing state oil and gas regulators over what they claim has been unfair treatment in allowing drilling near a low-income middle school.

The Greeley Tribune reports the case involves state drilling setbacks, which require oil and gas projects to be 1,000 feet from multiple occupancy structures and 500 feet from residences.

The residents filed the complaint against the Colorado Oil and Gas Conservation Commission, claiming commissioners erred in approving drilling permits for Extraction Oil and Gas.

The company's Vetting pad is about 1,200 feet away from the playground at Bella Romero Academy.