A stream winding through a populous area on the outskirts of Buenos Aires has turned crimson red in recent hours that has sparked fears of industrial chemical dumping.

The Sarandí Canal near Buenos Aires turned bright red, alarming residents and prompting an investigation into potential industrial pollution.

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.”

The Argentina Environment Ministry said in a statement that it had taken water samples from the 'bloody river' and said that the reason behind this could be the presence of an 'organic pigment'.

A stream outside Buenos Aires has turned crimson red raising fears among residents. Local officials suspect the presence of a toxic substance called aniline.