(CBS DETROIT) – An animal advocacy organization is offering a $5,000 dollar reward for a tip in the killings of 17 swans.

People for the ethical treatment of animals say since January dead swans have been found floating near Maceday Lake in Waterford.

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An investigation into the deaths found one of the birds possibly died from antifreeze poisoning.

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Anyone with information is asked to call the police or PETA’s poaching hotline.

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