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The flashing lights were spotted in the skies over Pennsylvania, USA, and local woman Stephanie Wilkerson filmed them from her garden.

She said that she initially thought they were coming from a plane – but then she realised the object wasn't moving.

She told ABC News: "I watched it for about 20 minutes and I started noticing it changing colours."

Technically it is an unidentified flying object as local police have no idea where the lights were coming from.

Officers phoned nearby airports and the National Guard training centre to see if there were any flights in the area at that time.

But after being told there were no planes in the sky when the video was shot, they are now stumped.

However, camerawoman Stephanie has made up her mind.

She added: "I am now a believer in UFOs."