An evacuation order has been lifted following a gas leak at a Gahanna building on Tuesday. The gas leak prompted residents of The Residences of Creekside apartments and some businesses at 151 Mill St. to evacuate just before 5 p.m. A fire official said the gas leak was a low-level carbon monoxide leak and that it was safe for residents to return. A COTA bus was in the area just in case it started storming so residents had a space to stay dry. Fire crews are going room by room with Columbia Gas to find the source of the leak.