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N.D. (AP) — North Dakota’s Health Department is warning about the presence of blue-green algae in some waters around the state.

The algae can produce toxins that can sicken and even kill both people and animals. Officials say there have already been reports of livestock deaths linked to the algae.

Recent reports of the algae in Stanley Pond in Mountrail County and the Harvey Reservoir in Wells County have led to exposure advisories at those recreation areas.

Hot summer weather and a lack of rainfall to help refresh bodies of water can contribute to the production of the algae.