The city was already proposed new rules for cooling towers, which the health department says was the source of the outbreak. CBS News New York's Dick Brennan reports.

New York City health officials are continuing to investigate a cluster of Legionnaires’ disease, a serious bacterial lung infection, where the number of cases has risen to 73, including three deaths.

The NYC Health Department reported at least 90 people have been infected since the outbreak began last month, and three people have died.