PORTER, Ind. The Coast Guard says it can't find any sign of shiny metallic flakes in Lake Michigan that led to beach closures.
Coast Guard Seaman James Connor says a helicopter brought in from Traverse City, Mich., to look for the substance so far has spotted only pollen blooms.
Beaches at the Indiana Dunes National Lakeshore and Indiana Dunes State Park were closed Monday after people reported being covered by the substance. Indiana Department of Environmental Management spokesman Dan Goldblatt says officials don't believe the substance came from shore.
National Lakeshore spokesman Bruce Rowe says swimmers were being allowed in the water Tuesday at their own risk. Dunes State Park property manager Brandt Baughman says the beach there was closed Tuesday because of high waves.