MILLICAN, OR -- Investigators looking into the tank explosion that killed two men earlier this week near Millican say the blast is the direct result of firing the tank destroyer’s gun. Although, they say the exact cause is still under investigation.

Search and Rescue volunteers from the Deschutes County Sheriff’s Office conducted a grid search of the scene to collect all evidence from the accident. The Medical Examiner has completed autopsies on the two Oregon City men killed Tuesday, but that report has not yet been released.