On Wednesday morning the river, which flows into the Alzette, had once again turned grey. Authorities are on site but have not yet identified the source of the pollution.

© Domingos Oliveira / RTL

© Domingos Oliveira / RTL

© Domingos Oliveira / RTL

© Domingos Oliveira / RTL

© Domingos Oliveira / RTL

© Domingos Oliveira / RTL

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