Animal activist groups were recently alerted to sightings of stray dogs with bright blue fur, which were spotted near an abandoned chemical plant in the Russian city of Dzerzhinsk, a Newsweek report reads.

The groups suspect the sightings were caused by the dogs being exposed to harmful chemicals leaked from the plant, RIA Novosti suggested in a tweet on Monday, Feb. 15.

The factory reportedly went bankrupt in 2015. When it was abandoned, stray animals were able to walk the premises, which may not have been completely cleared of toxic substances.

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Blue dogs likely came in contact with toxic substances

Though it is not yet known what exactly caused the dogs to attain the bright blue color, The Moscow Times points out that the abandoned factory produced plexiglass and hydrocyanic acid — essentially hydrogen cyanide dissolved in water.