Amsterdam police are urgently seeking the public's assistance in locating 43-year-old Polish national Mackowiak, who has been missing since Friday. Concerns are high regarding his well-being. Mackowiak was last seen in the vicinity of the Stadionbuurt and Vondelpark. Authorities are particularly interested in any sightings of Mackowiak himself or his black Audi Avant. He is described as having distinctive tattoos on his neck and an irregular set of teeth. His disappearance was officially reported today, prompting the release of images and a public appeal for information.