Minks infected with the mutated strain of the novel coronavirus were seen rising from the tomb this week after thousands were arrested in Denmark earlier this month.
The decision to kill the animals came in the wake of the discovery that 11 people fell ill from similar strains found in mink farms and factories.
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However, in a hurry to dispose of the bodies, Danish authorities reported on Thursday that some corpses had reached the surface of their makeshift graves after gases were built inside the decomposed bodies.
The bodies were buried in a military training area outside the city of Holstebro.
According to the Associated Press, the corpse fell into a pit only 8 feet deep and 10 feet wide, and the first meter of dead mink was covered with chalk before adding a second layer of dirt.
Yet, although the mink should be covered with at least 5 feet of soil, CBS News reported that they were only 3 feet deep and buried near a lake – raising concerns about possible pollution.
The fence cannot be erected until the tomb is monitored by officials, the leaders said.
The “zombie” mink is being exposed elsewhere and environmental officials have promised to fix the situation.
Some mayors have suggested burying mink corpses, according to USA Today.
Parliament has ordered the killing of about 15 million mink and all mink farming is banned by the end of next year. The country is the world’s largest exporter of mink fur.
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More than 74,700 cases and more than 800 deaths have been reported in Denmark, according to data from the Johns Hopkins Coronavirus Resource Center.