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Video and photos on Friday night showed the twin blue beams lighting up the New York City skyline.
Testing of the ceremony is a welcome sight for New Yorkers after the yearly memorial was almost cancelled in August due to the coronavirus pandemic.
The 9/11 Memorial and Museum originally announced that the lights would not shine this year.
"This incredibly difficult decision was reached in consultation with our partners after concluding the health risks during the pandemic were far too great for the large crew required to produce the annual Tribute in Light," officials wrote.
Photos: Up close look at the World Trade Center's 9/11 'Tribute in Light'
But support for the event was quickly rallied.
'Tribute in Light' back on as Cuomo pledges support from state
New York Gov. Andrew Cuomo said that New York State would provide the support needed to set up the art installation.
"This year it is especially important that we all appreciate and commemorate 9/11, the lives lost, and the heroism displayed as New Yorkers are once again called upon to face a common enemy," Cuomo said in a statement. "I understand the Museum's concern for health and safety, and appreciate their reconsideration. The state will provide health personnel to supervise to make sure the event is held safely while at the same time properly honoring 9/11. We will never forget."
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