A PCL cargo ship hit a pier at the Port of New Orleans and leaked oil, causing the closure to vessels of a section of the lower Mississippi River and cleanup efforts, which were ongoing.
The 2003-built Pac Antares was in allision with a pier at the Nashville Avenue Terminal Complex.
No people were reported injured but an unspecified volume of diesel did spill into the river before the leak could be plugged.
US Coast Guard (USCG) and local agencies responded to the incident under a unified command which deployed more than 100 people, 29 boats and six skimmers to remove oil from water and the shore.
An investigation is under way to determine the cause of the impact.
Pac Antares is moored at Nashille Avenue Wharf in the meantime.