New York City Mayor Bill de Blasio Bill de BlasioThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill New York again pushes back in-person classes The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks MORE (D) declared Saturday that the nation's largest school system would remain closed for the rest of the academic year, while Gov. Andrew Cuomo Andrew CuomoNew York City bus driver knocked out by passenger he told to wear a mask 44 percent of high earners have considered leaving New York City: poll Media's anti-Trump coronavirus spin has real consequences MORE (D) later pushed back, insisting that officials have not yet decided on when to reopen schools.

"After very careful consideration, I announce today that New York City public schools will remain closed for the remainder of this school year," de Blasio said at a public health conference Saturday, characterizing the step as a "public health decision."

JUST IN: New York City Mayor Bill de Blasio announces public schools will remain closed for the rest of the school year, calling it a public health decision: "It's the right thing to do. It clearly will help us save lives." https://t.co/hh2sXYD0Qj pic.twitter.com/VwC9GiCamX — ABC News Politics (@ABCPolitics) April 11, 2020

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The mayor called the move "the right thing to do," saying it was meant to "help us save lives."

However, Cuomo said during his own press conference later Saturday that "there has been no decision" on how much longer to keep schools closed.

He also suggested that the mayor did not have the authority to make a unilateral declaration.

"That's his opinion, but he didn't close them, and he can't open them," Cuomo said Saturday afternoon.

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The governor said he understands the mayor's position on wanting to close schools until June but added that no decision has been finalized.

"We may do that, but we're going to do it in a coordinated sense with the other localities," he said.

Cuomo added that "it makes no sense" for one school system to make a decision that is not coordinated with other localities.

JUST IN: New York Gov. Andrew Cuomo says "there has been no decision" made on NYC Mayor Bill de Blasio's announcement to keep public schools closed for rest of the year.



"That's his opinion, but he didn't close them and he can't open them." https://t.co/jqhCKX3aLV pic.twitter.com/gx3UKYfeII — ABC News (@ABC) April 11, 2020

De Blasio had announced the move on Saturday morning, seeking to extend a closure that took effect last month. Schools in the city have been slated to remain closed until at least April 20.

"Having to tell you that we cannot bring our schools back for the remainder of this school year is painful," de Blasio said Saturday.

He maintained that such a closure would aid in guaranteeing adherence to social distancing and shelter-in-place strategies, which aim to limit the spread of the coronavirus.

"All of the focused strategies that are finally beginning to bear fruit need the time to continue to be effective," de Blasio said.

He also lamented that the city would have to postpone efforts to improve its school system, saying it wanted to tackle inequalities and offer better opportunities for less fortunate students.

More than 7,800 people have died from the coronavirus in New York, according to data from Johns Hopkins University.

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On Friday, the state reported nearly 162,000 confirmed cases of the virus, more than any country in the world.

Centers for Disease Control and Prevention Director Robert Redfield said Thursday evening that the U.S. is approaching the peak of the outbreak, adding that "aggressive social distancing" measures have lowered the expected mortality rate.

Updated: 12:59 p.m.