A stream winding through a populous area on the outskirts of Buenos Aires has turned crimson red in recent hours, sparking fears of industrial chemical dumping, images shared by residents on social media showed Friday.

A stream south of the Argentine capital turned a freakish vermilion this week, prompting concerns about pollution. Officials said it could be the result of “some type of organic dye.”

Argentina's Sarandi Canal on the outskirts of Buenos Aires turned a shocking shade of crimson this week in eerie scenes reminiscent of a doomsday sign straight out of the Bible