Chemical Safety Board member John Bresland addresses the media during a press conference in Charleston Thursday morning. At left is CSB Chairman Rafael Moure-Eraso.

A CSB photo poster shows, from top to bottom, the phosgene pipe that failed in a fatal January 2010 leak, a hose that had previously failed in the phosgene unit, and a new hose of the type DuPont used in the phosgene unit.

CSB investigation team leader Johnnie Banks watches as media members are shown a video animation re-creating a fatal chemical leak at the DuPont Belle plant.