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The U.S. Coast Guard is warning beachgoers to "remain clear" if they come across a silver-shaped cylinder along the shoreline, as it could be an armed flare.
Coast Guard Sector Lake Michigan said in a statement three phosphorus pyrotechnic flares were unaccounted for after a joint military exercise with the Coast Guard and Air Force earlier this month offshore Milwaukee.
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During the exercise, four phosphorus pyrotechnics that were deployed did not activate when entering the water, according to officials.
One phosphorous pyrotechnic was located on Montrose Beach, Illinois, by a lifeguard on May 26.
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However, three phosphorus pyrotechnics are still unaccounted for.
The missing pyrotechnics are still considered armed when they do not activate.
Phosphorus pyrotechnics produce a red smoke and flame that can reach temperatures of 2,900 degrees Fahrenheit, according to military officials.
