The Coast Guard is responding to an oil spill after an oil tank platform collapsed at the Hilcorp Caillou Island facility in Terrebonne Bay, Louisiana.  (U.S. Coast Guard courtesy photo) NEW ORLEANS — The Coast Guard is responding to an oil spill after an oil tank platform collapsed at the Hilcorp Caillou Island facility in Terrebonne Bay, Louisiana. Coast Guard Marine Safety Unit Houma personnel...