A gas leak was reported Wednesday afternoon on Scott Air Force Base at Seibert Road.
Brian Bretsch, a spokesman from Ameren Illinois, said the leak did not affect its customers.
According to Ameren Illinois, a third party struck a 3-inch, steel, gas-distribution line. The gas leak was reported after 3 p.m. Wednesday.
Ameren Illinois crews were expected to work throughout the night. Local fire departments assisted on scene.