Overview

• Coast Guard Sector Lake Michigan issued an alert Tuesday about three unaccounted phosphorous pyrotechnics in the lake
• Four silver-shaped cylinders did not activate when deployed during a joint exercise with the Air Force off Milwaukee earlier in May
• A lifeguard discovered the first device on Chicago’s Montrose Beach over the Memorial Day weekend
• Officials say the armed pyrotechnics can produce red smoke and flames reaching 2900°F if triggered
• Beachgoers are urged to avoid touching any silver-shaped cylinder they find and to call 911 immediately