A strange light that hovered over the St. Louis Gateway Arch this week is sparking plenty of debate on the internet.

Surveillance footage recorded at Malcolm W Martin Memorial Park on Tuesday and posted to Facebook shows the mysterious object hovering over the famous arch. We guarantee you will be perplexed if you watch all 5 minutes of this surveillance footage! explained the Park, in a post on its Facebook page. The video has been viewed 615,000 times.

Possible explanations for the light suggested by commenters on Facebook include a drone with a unidirectional light or a Chinese lantern.

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