Rainwater left untreated in cooling towers atop city-owned Harlem Hospital fueled the Big Apple’s deadliest Legionnaire’s disease outbreak in a decade, the Rev. Al Sharpton charged Tuesday.

A Legionnaires' outbreak in Harlem has prompted concerns about NYC's health oversight after a decline in cooling tower inspectors, despite funding increases. Former Governor Cuomo seeks an independent probe into the city's handling of the crisis.

Two construction workers who claim they contracted Legionnaires' disease while working at or near Harlem Hospital Center are suing contractors they allege failed to safeguard water cooling towers at the building against contamination by the bacteria that causes the illness.