An outbreak of Legionnaires’ disease in New York City has killed two people and sickened 58 since late July. City health officials link the Central Harlem outbreak to cooling towers, structures containing water and a fan that are used to cool buildings.

Three people have died and at least 67 people have been diagnosed with Legionnaires’ disease in a cluster that broke out in the Harlem area of New York City last week, officials said in an update on Tuesday.

Fifty-eight people in New York City have been diagnosed with Legionnaires’ disease, a serious bacterial lung infection, and two people have died, according to the city health department.