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DULUTH - Scientists are investigating an unprecedented algae bloom in Lake Superior and have sent samples for lab testing to determine if it's toxic.
Minnesota Public Radio reports that kayakers and other visitors to the popular lakeshores along eastern Minnesota and northwestern Wisconsin found green scummy algae last week on Lake Superior's surface.
Robert Sterner directs the Large Lakes Observatory at the University of Minnesota-Duluth. He says the bloom has largely dissipated but reports suggest it stretched 50 miles (80.5 kilometers) along the shoreline from near Superior, Wisconsin, to the Apostle Islands.
Blue-green algae blooms have become more common in other U.S. lakes and rivers . Scientists say the increase is partly because of warming water temperatures.
Researchers expect to know by the end of the week whether the bloom was toxic.
MADISON, WIS. (AP) - Madison officials say Federal Immigration and Customs Enforcement agents violated city policy by detaining at least six immigrants without letting police know ahead of time.
Madison Police Chief Mike Koval says the department has a working relationship with ICE, but the federal agency did not follow protocol. Koval says ICE has agreed to call the assistant police chief before making arrests in Madison. This time the agency called the Dane County Communications Center.
Koval says the arrests were made at separate workplaces and are not considered to be part of a raid. He says the community is in "hyper-warp distress mode."
Madison Mayor Paul Soglin says ICE told city officials the people arrested are believed to have committed serious crimes, but he does not know the specifics of the investigation.
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