A Legionnaires’ disease outbreak in Harlem has claimed a fourth life, with nearly 100 confirmed cases and more than a dozen people still hospitalized. For the first time, city officials have identified 12 cooling towers that tested positive for Legionella bacteria — including four city-owned buildings such as Harlem Hospital.

Some in the area say they were unaware of the outbreak of Legionnaires' disease, let alone the location of problem sites.

Three people in central Harlem have already died from legionnaires’ disease, according to the NYC Health Department.