Governor Andrew Cuomo has declared a state of emergency in New York state after the number of coronavirus cases almost doubled in 24 hours.

Mr Cuomo said the number of confirmed coronavirus cases had risen from 44 to 76 in the state, with 11 in New York City.

Speaking at a news conference on Saturday, the governor said health authorities had been "aggressively testing" for coronavirus cases in recent days.

New York authorities have placed dozens of people under mandatory quarantine as a precaution.

"There's no doubt that massive quarantine is the best way to slow the spread," Mr Cuomo said.