The towboat Altro Donna sank on the Mississippi River at Marrero, Louisiana.   The Altro Donna was proceeding with eight empty containers when it struck a piling while attempting to dock at Marrero.  The three crew on board were able to escape as the vessel filled with water and sank.  No reports of injuries.   The Altro Donna had 11,500 gallons of diesel fuel when it sank.   Authorities have stated there was a sheen over the sunken towboat.  The  Coast Guard is conducting an investigation into the incident.