Flights to LaGuardia airport are delayed after an explosion at a transformer briefly disrupted power supply and prompted it to divert some planes.

Delta Air Lines Inc. and American Airlines diverted some of their flights to nearby airports, according to LaGuardia’s website. Other services are being delayed.

The airport had to switch to backup facilities after a fire at a substation in Astoria, New York City, caused a dip in transmission and flickering lights in northern Queens, said Bob McGee, a spokesman for utility Consolidated Edison Inc.

Con Edison said there was a brief electrical fire around 9 p.m. local time involving several transformers. All power lines in the area are now operating and stable, the company said in a statement, adding it’s investigating the cause of the incident.

NYC’s public transit system has power but there are delays on the No. 7 train, Mayor Bill de Blasio said on Twitter.

[From Skift: As of 11 p.m. Thursday local time, LaGuardia announced that power had been restored to all terminals, and advised passengers to check with their airlines before heading to the airport.]

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Photo Credit: The night sky over New York City lit up after a Con Ed transformer blew up in Queens, causing delays at LaGuardia Airport. Bloomberg