Footage released by tabloid Ekstra Bladet showed a man resembling Peter Madsen sitting up against a fence surrounded by police forces at a distance.
Madsen was sentenced to life in prison in 2018 for murdering, sexually mutilating and dismembering Wall aboard the submarine in Copenhagen harbour.
Police later said the operation, taking place less than a kilometre from the prison where Madsen is serving his sentence, was over and that the man under arrest had been taken away.
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