The light went from white to yellow to an incandescent blue - and with a level of clouds hanging above the New York City skyline, the effect was striking.
Because a "couple of transformers tripped offline" at the intersection of 20th Avenue and 32nd Street in Astoria, Queens, around 9 p.m., multiple fires were taking place, Con Edison spokesperson Bob McGee told CNN.
"Am I witnessing an alien invasion?".
Photos posted onto social media showed a bright light burning as it was followed by a unusual, wispy trail.
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The explosion also knocked out power out at Rikers Island, and some subway lines were disrupted including on the E, F, and R trains and the 7 line.
An electrical arc occurs when an electric current flows between two points and produces plasma, which causes visible light. De Blasio's spokesman Eric Phillips tweeted that "scattered" power outages were reported elsewhere.
Locals first noticed flickering lights, before turning their gaze outside to see a bright teal light pulsating for minutes.
The lights flickered. A giant plume of smoke filled the New York City sky and turned it blue.
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NYPD is investigating a possible transformer explosion at the ConEd plant in Astoria.
Also on Thursday, a power outage at LaGuardia Airport, which is located in Queens, prompted flight cancellations, the NY affiliate of NBC reported. The airport tweeted that it was experiencing delays and that some flights were not departing as a result of the incident.
NYPD Chief Terence Monahan confirmed there had been an explosion and that the fire was under control.
Even LaGuardia Airport grounded flights temporarily.
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Another user asked: "Why is the sky lit up bright blue in Queens New York City right now?"