After a video featuring a strange phenomenon surfaced online, social media users came up with a whole array of theories as to what it was, beginning with a reflection of sunlight, and ending with an "alien invasion".

Residents of the coastal city of Bangor in Northern Ireland witnessed two strange lights of unknown origin over the surface of one of the city's bays. A video showing the phenomenon was published by the PenNews online media outlet and a photo of the anomaly was uploaded on the Bangor Life Facebook group's page, with the author of the post wondering about the possible nature of the lights.

To read more and view the video, click here.