BOSTON (CBS) — A warning to stay out of the Charles River in Boston was issued by the Charles River Watershed Association after they found a bloom of cyanobacteria.

The public health advisory includes the river from the Mass. Ave Bridge to the Museum of Science.

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Boaters should avoid contact with the water and dog owners should not let pets swim in the area.

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Cyanobacteria, the toxic algae found in the Charles River seen in  2019. (Photo credit: Charles River Watershed Association)

Cyanobacteria is a toxic blue-green algae. The algae can make people sick and it could be fatal for pets.

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According to the Association, the algae is appearing earlier than it did last year, likely due to the recent heat and sunshine.