Abstract: At approximately 2:00 a.m. on January 6, 1993, Employees #1 through #4 were at work during the night shift in a factory when an explosion of unknown origin occurred. The explosion blew out concrete block walls and engulfed the factory in flames and smoke. Employees #3 and #4 escaped through an opening created by a downed wall. They were injured, but did not require hospitalization. Employees #1 and #2 died of multiple injuries and smoke inhalation. One employee was found dead later that same day. The other employee was found dead in the rubble four days later. Exit doors were kept locked and latched during the night shift.