This mysterious blue light across the New York sky had people wondering if aliens had arrived.
This mysterious blue light across the New York sky had people wondering if aliens had arrived.

‘Aliens’: Mysterious glow baffles New York

AMERICANS have been baffled by a mysterious blue light that illuminated the night sky in New York City.

Twitter was flooded with curiosity, with post questions whether the powerful glow was caused by everything from a UFO, to a secret party.

It was a scene that could have been an alternate plot line to War of the Worlds, a bright flash followed by power outages, according to one Twitter user.

But it wasn't signalling the arrival of an alien invasion. In fact, it was something far less exciting than residents had hopes.

NBC News reports the striking display was caused by a transformer explosion at the Con Edison power plant in Astoria East and North Queens - about half an hour away from the city centre.

It went off at about 9pm (1pm AEDT).

A spokesman for Mayor Bill de Blasio tweeted their had been "scattered power outages".

It's not the first time the ominous glow has caught New York City residents by surprise.

A video by The Weather Channel shows a 2012 explosion at the same power plant produced the same result.