Overview
- Milwaukee fire investigators concluded disposable rags soaked with cleaning chemicals underwent a chemical reaction and spontaneously combusted, and they found no evidence of arson.
- Surveillance video supplied by the district showed custodial staff cleaning and placing the chemical‑soaked rags in a plastic garbage can in a second‑floor hallway where smoke appeared before flames spread.
- Investigators say heat from the rags’ chemical reaction produced smoke about 30 minutes before emergency calls and allowed flames to spread to hallway furniture and stored items.
- Milwaukee Public Schools has retrained custodial staff, issued approved metal disposal containers for oily or chemical rags, required end‑of‑shift door and window closures, and will demolish the damaged portions of the building.
- Lincoln Avenue students and programming will move to Pulaski High School for the coming year, and officials warn that only two district schools have full sprinklers with 20 others partially covered, a gap that could drive future safety investments.