Three people have died and at least 67 people have been diagnosed with Legionnaires’ disease in a cluster that broke out in New York City last week.

New York City Department of Health inspectors are fanning out across Central Harlem to inspect cooling towers amid a deadly outbreak of Legionnaires' disease. So far there have been 67 cases identified since July 25.

Legionnaires' disease is a type of pneumonia caused by bacteria that grows in warm water. It has infected 67 people in a growing cluster of disease in New York.