The U.S. Coast Guard is asking beach visitors along Lake Michigan to be on the lookout for potentially dangerous pyrotechnic devices.
Officials say four phosphorus flares failed to ignite during a joint training exercise with the U.S. Air Force earlier this month and could wash up on shore.
One silver-colored cylinder was already found on Montrose Beach in Illinois, while three remain missing. T
he devices emit red smoke and flames and can reach temperatures of up to 2,900 degrees Fahrenheit.
