HOUSTON A natural gas pipeline erupted in flames in Mont Belvieu after it was accidentally cut Wednesday afternoon by a contractor, officials said. At about 4:45 p.m., the rupture and fire was reported on the line owned by Lone Star NGL, company officials said. The fire and efforts to bring it under control closed Texas 146, however, a Mont Belvieu spokesman said. Firefighters have the leak contained and are monitoring while flames burn themselves out, spokesman Brian Ligon said. Due to the ongoing firefighting operations, water pressure throughout the city may be affected as the public works department divert as much water as possible to support the response to the blaze.