A major bloom of blue-green algae has been discovered in part of the Charles River, prompting a public health advisory for people not to swim, fish, boat, or take part in other forms of recreation. The algae, formally known as cyanobacteria, was confirmed downstream of the Longfellow Bridge on Thursday by the state Department of Public Health.

The Massachusetts Department of Public Health posted an advisory for the area of the river between the Longfellow Bridge and the Cambridge Dam due to a bloom of cyanobacteria. Cyanobacteria is a blue-green algae that can release cyanotoxins,

The Massachusetts Department of Public Health has listed part of the Charles River in a harmful cyanobacterial bloom advisory.

A toxic algae bloom is affecting part of the Charles River between Boston and Cambridge. FCC Chair Responds to Trump’s Demand to Shut Down ABC After Debate DWTS Stars Dwight Howard & Daniella Karagach Talk Height Difference: "We Just Go With the Flow" | THR Video Once-in-a-lifetime shot!