NEW ORLEANS — The Coast Guard has responded to a report of a natural gas pipeline fire, 25 miles south of Marsh Island, Wednesday.Watchstanders at Coast Guard Sector New Orleans received notification at 8:30 p.m. that a natural gas pipeline had ruptured and was on fire. Sector New Orleans directed the launch of a HC-144 Ocean Sentry fixed-wing aircraft crew from Aviation Training Center Mobile to monitor the situation.The dive operation vessel Ms. Kerci was working on the pipeline at the time of the rupture. Two crew members aboard the vessel were injured and are being escorted to Houma.The pipeline is reported to be extinguished.The pipeline's owner, Boardwalk/Gulf South Pipeline Co., is sending out a second vessel to repair the ruptured pipeline.The cause of the incident is under investigation.