The sinking of a towboat in the Lower Mississippi River near New Orleans last March that killed two mariners is being blamed on the towboat company, in a new report from the National Transportation Safety Board (NTSB). A Marine Accident Brief issued by the agency said the company’s decision to ignore its own pre-employment hiring procedures led to an inadequately vetted pilot on board the Natalie Jean, a towing vessel on which he did not have previous experience.