Refinery Explosion

Chemical Safety Board

A culture of complacency at Tesoro’s Anacortes refinery led to the deadly fireball that claimed the lives of seven workers in 2010, according to federal investigators who've spent almost four years examining the causes.

The equipment that exploded in the early hours of April 2, 2010 had developed leaks that the company knew about. The carbon steel tubing of the equipment had been weakened over time by hydrogen and that had caused cracks. 

AP

The families of six Tesoro Corporation refinery workers killed in an explosion at an Anacortes site last April have filed a wrongful-death suit against the company Wednesday. 

The Seattle Times' Jim Brunner reports the suit alleges Tesoro was negligent in addressing the conditions that resulted in the blast, which killed seven people. In addition to the six families, a contractor injured in the explosion has also joined the suit.