Abstract: At 10:30 a.m. on October 3, 1993, Employees #1 and #2, both Los Angeles Fire Department fire fighters, were on a rooftop participating in a ventilation operation as part of a fire suppression operation going on at a commercial building. The structure had four skylights that had been covered over with roof tar, so they were undetectable by those on the rooftop. Three of the covered skylights were not covered to code standard. Employees #1 and #2 fell through the skylights to a concrete floor 24 feet below. Employee #1 sustained fractured ankles, a crushed left foot, and a fractured tibia. Employee #2 sustained a fractured wrist. No accident related citations were issued.