A fireman at the scene said some homes had to be evacuated for safety reasons, but residents were allowed back into their houses shortly after the gas leak had been "isolated".
Cordons were to stay in place on Thursday until they find no traces of the leak and could deem it safe, a fire communications spokesperson said.
Road closures caused jams for residents attempting to return home to Railway Rd off State Highway 2 as vehicles began to pile up at the intersection.
The fire communications spokesperson said concrete work had been going on in the area and they suspected that it may have been the cause of the leak, but could not officially confirm it.