An inmate at a federal jail in New York City has tested positive for the novel coronavirus, becoming the first confirmed case in the U.S. federal prison system, according to AP on Saturday. 

The inmate has returned from the hospital and is in isolation at the jail, the report said. 

Total confirmed cases of COVID-19 cases in the U.S. has topped 20,000 as of 1:30 p.m. local time on Saturday (1730 GMT), according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University.

Governor of the U.S. state of New York Andrew Cuomo said Saturday that New York City has become the hotspot of COVID-19, with over 6,200 cases.

Cuomo said that 55 percent of people in New York state who tested positive for novel coronavirus are between the ages of 18 and 49.

On Friday, U.S. President Donald Trump approved a major disaster declaration for the state of New York over the rapid spread of the novel coronavirus.