A horse was found jammed in the ventilation shaft on the 12th floor and apartment block after residents complained about a smell.
Residents in the tower block in Prokuplje, southern Serbia, called police who immediately ordered the building to be evacuated because of fears the overpowering fumes could be lethal.
A police spokesman said: "The smell was absolutely noxious. We had no idea what it was at first and did not want to take any risks.
"We even had to call in a special unit which deals with dangerous chemicals. Eventually though our officers tracked down the stink to the air vents and finally found the putrefying remains which were identified as a horse.
"How on earth someone managed to get a horse's body 12 stories up and why someone would put it there though we have no idea."
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Image Above: a random horse.