This water is raising a red flag. A canal in Argentina mysteriously turned bright red on Thursday, alarming residents who were woken up by its strong odor. “The smell woke us up. In the daytime, when we looked at this side of the river,

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.”

A canal in a suburb of Argentina's capital Buenos Aires turned bright red on Thursday, alarming local residents. Pictures and videos show the intensely coloured water flowing into an estuary, the Rio de la Plata, which borders an ecological reserve.