A river in Russia turned bright red this week, leaving residents stunned.
Those living in the Russian city of Norilsk, inside the Arctic Circle, have been posting photos on social media of an alarming sight: a vibrant red river.
It's called the Daldykan River, and it's now red.
So, what's the deal?
Is it a chemical leak, a prank or something else? Locals think it's runoff from a nearby nickel plant. Environmentalists suspect that might be the source, too.
Russia's natural resources and environment ministry said that the blood-red color was possibly caused by a "break in a Norilsk Nickel slurry pipe," according to The Guardian's translation of the Russian press release.
Authorities are currently investigating why the river changed colors and are evaluating possible environmental damages.