NEW YORK -- Governor of the US state of New York declared a state of emergency on Saturday as the number of confirmed coronavirus cases in the northeastern state rose to 76.

At a press conference, Governor Andrew Cuomo said that New York City, the most populous metropolis in the country, has seen 11 cases, and Westchester County now has 57, an increase of 23 overnight.

Long Island's Nassau County has four, Rockland County has two and Saratoga County has two new cases.

All cases in Westchester County are related to the state's second confirmed case, which involves an attorney who worked in Manhattan.

"Westchester is an obvious problem for us," the governor said. "They talk about the contagion in clusters and the clusters tend to infect more and more people."

However, Cuomo repeatedly urged the public to stay calm, noting that about 80 percent of the COVID-19 patients will self-resolve.

As to the 20 percent who have to be hospitalized, Cuomo said most of them are senior citizens and those with underlying health issues.

The state is "hyper cautious" about nursing homes and senior centers where the vulnerable people gather, he said.