VIDEO: City of Phoenix officials say the Seventh Street bridge over the Salt River will be closed for several months after a gas line break led to a huge fire this morning. The fire started around 4 a.m. Sunday after a gas line break near 7th Street and University Drive. When crews arrived at the scene, Phoenix fire officials say they found "heavy fire and intense heat coming from under the bridge." Witnesses reported seeing flames 20 to 30 feet high. Crews were able to contain the fire by 6 a.m. No firefighters or citizens were injured. "I am profoundly grateful this wasn't worse," said Phoenix Mayor Kate Gallego. "It could have been." Capt. Scott Douglas with the Phoenix Fire Department said a ten-inch gas line main broke near the bridge. Southwest Gas crews were able to quickly secure the gas line. The heat from the flames caused extensive damage to the bridge. The heat also melted a light pole. After a structural engineer evaluated the safety of the bridge, it was closed in both directions.