The U.S. Coast Guard has issued an urgent warning to beachgoers in Lake Michigan after three unaccounted phosphorus pyrotechnics were discovered, which could pose a risk if encountered. These flares, which can produce a red smoke and flame reaching temperatures of 2,900 degrees Fahrenheit, are still considered armed when they do not activate. The Coast Guard Sector Lake Michigan stated that during a joint military exercise with the Coast Guard and Air Force earlier this month offshore Milwaukee, four phosphorus pyrotechnics were deployed but did not activate when entering the water. One flare was located on Montrose Beach, Illinois, by a lifeguard on May 26. However, three phosphorus pyrotechnics are still unaccounted for, raising concerns about their potential danger. The Coast Guard is urging the public to remain clear if they come across a silver-shaped cylinder along the shoreline, as it could be an armed flare. Military officials have emphasized the need for public awareness and caution to prevent any potential incidents involving these unaccounted flares.