The U.S. Chemical Safety Board (CSB) investigation team that deployed to the April 26, 2018, explosion at the Husky Energy oil refinery in Superior, Wisconsin. This is a brief update of the CSB’s ongoing work:

• The CSB investigation team arrived in Superior the evening of April 26 and to date has photo-documented a large percentage of the refinery. The investigation team has also conducted interviews with approximately 50 Husky Energy employees and contractors who were working at the facility on the day of the incident.